Adjust background of emoji panel (#1461)
Adjust background of emoji panel (#1461)

Addresses #1451 which notes the emoji picker is too light. I agree, so I submit this adjustment.

Changes:
Changed the background to a darkened version of another system color
thor-the-norseman/mastodon,saggel/mastodon,Chronister/mastodon,glitch-soc/mastodon,Kyon0000/mastodon,robotstart/mastodon,im-in-space/mastodon,clworld/mastodon,h3zjp/mastodon,WitchesTown/mastodon,verniy6462/mastodon,salvadorpla/mastodon,danhunsaker/mastodon,foozmeat/mastodon,lynlynlynx/mastodon,mecab/mastodon,narabo/mastodon,yukimochi/mastodon,honpya/taketodon,imomix/mastodon,KnzkDev/mastodon,yukimochi/mastodon,KnzkDev/mastodon,pixiv/mastodon,h3zjp/mastodon,imomix/mastodon,havicon/mastodon,HogeTatu/mastodon,tootcafe/mastodon,rutan/mastodon,3846masa/mastodon,tateisu/mastodon,kazh98/social.arnip.org,haleyashleypraesent/ProjectPrionosuchus,vahnj/mastodon,res-ac/mstdn.res.ac,dunn/mastodon,thor-the-norseman/mastodon,Arukas/mastodon,TootCat/mastodon,Ryanaka/mastodon,Monappy/mastodon,pfm-eyesightjp/mastodon,yukimochi/mastodon,masto-donte-com-br/mastodon,nonoz/mastodon,cybrespace/mastodon,ebihara99999/mastodon,h-izumi/mastodon,moeism/mastodon,ikuradon/mastodon,hugogameiro/mastodon,NS-Kazuki/mastodon,rainyday/mastodon,mstdn-jp/mastodon,glitch-soc/mastodon,8796n/mastodon,ambition-vietnam/mastodon,yi0713/mastodon,yukimochi/mastodon,ikuradon/mastodon,anon5r/mastonon,musashino205/mastodon,vahnj/mastodon,YuyaYokosuka/mastodon_animeclub,mecab/mastodon,jukper/mastodon,res-ac/mstdn.res.ac,mosaxiv/mastodon,ikuradon/mastodon,dunn/mastodon,YuyaYokosuka/mastodon_animeclub,masto-donte-com-br/mastodon,ms2sato/mastodon,riku6460/chikuwagoddon,theoria24/mastodon,d6rkaiz/mastodon,danhunsaker/mastodon,RobertRence/Mastodon,ikuradon/mastodon,lindwurm/mastodon,TootCat/mastodon,glitch-soc/mastodon,mstdn-jp/mastodon,mstdn-jp/mastodon,mhffdq/mastodon,ms2sato/mastodon,hyuki0000/mastodon,pinfort/mastodon,dwango/mastodon,primenumber/mastodon,koba-lab/mastodon,lindwurm/mastodon,Kyon0000/mastodon,lindwurm/mastodon,librize/mastodon,foozmeat/mastodon,MitarashiDango/mastodon,ykzts/mastodon,Kirishima21/mastodon,lindwurm/mastodon,Arukas/mastodon,5thfloor/ichiji-social,3846masa/mastodon,SerCom-KC/mastodon,palon7/mastodon,tri-star/mastodon,codl/mastodon,hyuki0000/mastodon,pinfort/mastodon,koteitan/googoldon,koteitan/googoldon,ykzts/mastodon,ebihara99999/mastodon,h3zjp/mastodon,hyuki0000/mastodon,res-ac/mstdn.res.ac,saggel/mastodon,unarist/mastodon,musashino205/mastodon,mimumemo/mastodon,8796n/mastodon,riku6460/chikuwagoddon,h-izumi/mastodon,rekif/mastodon,moeism/mastodon,esetomo/mastodon,imas/mastodon,pso2club/mastodon,tri-star/mastodon,amazedkoumei/mastodon,kagucho/mastodon,HogeTatu/mastodon,thnkrs/mastodon,ambition-vietnam/mastodon,jukper/mastodon,developer-mstdn18/mstdn18,sylph-sin-tyaku/mastodon,tri-star/mastodon,robotstart/mastodon,Ryanaka/mastodon,yi0713/mastodon,haleyashleypraesent/ProjectPrionosuchus,pfm-eyesightjp/mastodon,blackle/mastodon,Kirishima21/mastodon,SerCom-KC/mastodon,cybrespace/mastodon,rutan/mastodon,KnzkDev/mastodon,8796n/mastodon,infinimatix/infinimatix.net,mosaxiv/mastodon,pso2club/mastodon,verniy6462/mastodon,masarakki/mastodon,pointlessone/mastodon,hugogameiro/mastodon,Nyoho/mastodon,dissolve/mastodon,mimumemo/mastodon,esetomo/mastodon,theoria24/mastodon,librize/mastodon,salvadorpla/mastodon,3846masa/mastodon,sylph-sin-tyaku/mastodon,primenumber/mastodon,pfm-eyesightjp/mastodon,thor-the-norseman/mastodon,nonoz/mastodon,pointlessone/mastodon,YuyaYokosuka/mastodon_animeclub,honpya/taketodon,tootsuite/mastodon,hyuki0000/mastodon,dwango/mastodon,primenumber/mastodon,Monappy/mastodon,kazh98/social.arnip.org,RobertRence/Mastodon,Arukas/mastodon,NS-Kazuki/mastodon,TheInventrix/mastodon,maa123/mastodon,unarist/mastodon,yi0713/mastodon,dwango/mastodon,masarakki/mastodon,honpya/taketodon,riku6460/chikuwagoddon,verniy6462/mastodon,tateisu/mastodon,pixiv/mastodon,RobertRence/Mastodon,MitarashiDango/mastodon,infinimatix/infinimatix.net,glitch-soc/mastodon,MastodonCloud/mastodon,res-ac/mstdn.res.ac,unarist/mastodon,ebihara99999/mastodon,imas/mastodon,Nyoho/mastodon,mhffdq/mastodon,mhffdq/mastodon,summoners-riftodon/mastodon,MastodonCloud/mastodon,palon7/mastodon,NS-Kazuki/mastodon,rutan/mastodon,ebihara99999/mastodon,tateisu/mastodon,sinsoku/mastodon,kazh98/social.arnip.org,pso2club/mastodon,im-in-space/mastodon,havicon/mastodon,codl/mastodon,haleyashleypraesent/ProjectPrionosuchus,Monappy/mastodon,TheInventrix/mastodon,nonoz/mastodon,alarky/mastodon,Arukas/mastodon,Ryanaka/mastodon,h3zjp/mastodon,developer-mstdn18/mstdn18,tootsuite/mastodon,tootsuite/mastodon,rainyday/mastodon,nonoz/mastodon,kirakiratter/mastodon,SerCom-KC/mastodon,lynlynlynx/mastodon,increments/mastodon,foozmeat/mastodon,rekif/mastodon,Toootim/mastodon,danhunsaker/mastodon,robotstart/mastodon,imomix/mastodon,ambition-vietnam/mastodon,alarky/mastodon,yi0713/mastodon,im-in-space/mastodon,vahnj/mastodon,heropunch/mastodon-ce,kirakiratter/mastodon,gol-cha/mastodon,HogeTatu/mastodon,5thfloor/ichiji-social,TootCat/mastodon,foozmeat/mastodon,mecab/mastodon,infinimatix/infinimatix.net,Ryanaka/mastodon,koteitan/googoldon,Kirishima21/mastodon,tootcafe/mastodon,corzntin/mastodon,jukper/mastodon,heropunch/mastodon-ce,Monappy/mastodon,masto-donte-com-br/mastodon,increments/mastodon,narabo/mastodon,amazedkoumei/mastodon,mosaxiv/mastodon,dunn/mastodon,rainyday/mastodon,cobodo/mastodon,h-izumi/mastodon,mosaxiv/mastodon,palon7/mastodon,koteitan/googoldon,masto-donte-com-br/mastodon,thnkrs/mastodon,masarakki/mastodon,amazedkoumei/mastodon,gol-cha/mastodon,riku6460/chikuwagoddon,tootcafe/mastodon,Toootim/mastodon,corzntin/mastodon,primenumber/mastodon,danhunsaker/mastodon,unarist/mastodon,sylph-sin-tyaku/mastodon,kirakiratter/mastodon,koba-lab/mastodon,sinsoku/mastodon,PlantsNetwork/mastodon,corzntin/mastodon,3846masa/mastodon,Toootim/mastodon,pointlessone/mastodon,theoria24/mastodon,kagucho/mastodon,koba-lab/mastodon,TootCat/mastodon,increments/mastodon,havicon/mastodon,TheInventrix/mastodon,ms2sato/mastodon,Craftodon/Craftodon,anon5r/mastonon,mecab/mastodon,Chronister/mastodon,clworld/mastodon,dissolve/mastodon,rekif/mastodon,PlantsNetwork/mastodon,Gargron/mastodon,alarky/mastodon,Craftodon/Craftodon,hugogameiro/mastodon,anon5r/mastonon,PlantsNetwork/mastodon,gol-cha/mastodon,kagucho/mastodon,librize/mastodon,cobodo/mastodon,masarakki/mastodon,haleyashleypraesent/ProjectPrionosuchus,kagucho/mastodon,cybrespace/mastodon,YuyaYokosuka/mastodon_animeclub,pixiv/mastodon,alarky/mastodon,koba-lab/mastodon,pso2club/mastodon,saggel/mastodon,cobodo/mastodon,Craftodon/Craftodon,Craftodon/Craftodon,salvadorpla/mastodon,MastodonCloud/mastodon,dwango/mastodon,TheInventrix/mastodon,dunn/mastodon,Nyoho/mastodon,rekif/mastodon,im-in-space/mastodon,abcang/mastodon,vahnj/mastodon,TheInventrix/mastodon,Toootim/mastodon,pfm-eyesightjp/mastodon,anon5r/mastonon,kirakiratter/mastodon,d6rkaiz/mastodon,musashino205/mastodon,palon7/mastodon,tateisu/mastodon,MitarashiDango/mastodon,KnzkDev/mastodon,developer-mstdn18/mstdn18,Kyon0000/mastodon,narabo/mastodon,MitarashiDango/mastodon,gol-cha/mastodon,thnkrs/mastodon,theoria24/mastodon,Gargron/mastodon,d6rkaiz/mastodon,summoners-riftodon/mastodon,imas/mastodon,vahnj/mastodon,abcang/mastodon,WitchesTown/mastodon,esetomo/mastodon,summoners-riftodon/mastodon,lynlynlynx/mastodon,blackle/mastodon,musashino205/mastodon,clworld/mastodon,honpya/taketodon,cybrespace/mastodon,heropunch/mastodon-ce,abcang/mastodon,rainyday/mastodon,tri-star/mastodon,PlantsNetwork/mastodon,mimumemo/mastodon,pinfort/mastodon,verniy6462/mastodon,pinfort/mastodon,dissolve/mastodon,NS-Kazuki/mastodon,salvadorpla/mastodon,ykzts/mastodon,Chronister/mastodon,abcang/mastodon,RobertRence/Mastodon,summoners-riftodon/mastodon,imas/mastodon,WitchesTown/mastodon,MastodonCloud/mastodon,Kirishima21/mastodon,rutan/mastodon,blackle/mastodon,Nyoho/mastodon,hugogameiro/mastodon,d6rkaiz/mastodon,Gargron/mastodon,sinsoku/mastodon,tootsuite/mastodon,clworld/mastodon,h-izumi/mastodon,lynlynlynx/mastodon,mimumemo/mastodon,5thfloor/ichiji-social,WitchesTown/mastodon,increments/mastodon,codl/mastodon,kazh98/social.arnip.org,blackle/mastodon,maa123/mastodon,amazedkoumei/mastodon,cobodo/mastodon,tootcafe/mastodon,Chronister/mastodon,ykzts/mastodon,codl/mastodon,pixiv/mastodon,sylph-sin-tyaku/mastodon,corzntin/mastodon,esetomo/mastodon,maa123/mastodon,moeism/mastodon,mstdn-jp/mastodon,pointlessone/mastodon,mhffdq/mastodon,narabo/mastodon,ambition-vietnam/mastodon,imomix/mastodon,SerCom-KC/mastodon,5thfloor/ichiji-social,maa123/mastodon