Fix a naive term highlighting function to handle multiple words correctly.
Fix a naive term highlighting function to handle multiple words correctly.

Wish this was shorter.

mrmr1993/vimium,smblott-github/vimium-smblott,smblott-github/vimium-smblott,PickRelated/vimium,poacher2k/vimium,tuchangwei/vimium,borgified/vimium,zhangmin510/vimium,philc/vimium,douglas-larocca/vimium,mrmr1993/vimium,elderbas/vimium,Robinson10240/vimium,jb55/vimium-plus,smblott-github/vimium,elegantwww/vimium,philc/vimium,Lw-Cui/vimium,hhsue/vimium,PrestanceDesign/vimium,Aleroniponi/vimium,jb55/vimium-plus,PrestanceDesign/vimium,douglas-larocca/vimium,willsALMANJ/vimium,Robinson10240/vimium,csmalin/vimium,gdh1995/vimium,PickRelated/vimium,Lw-Cui/vimium,elderbas/vimium,VPashkov/vimium,PrestanceDesign/vimium,mrmr1993/vimium,cyrixhero/vimium,elegantwww/vimium,csmalin/vimium,dimatter/vimium,wildeyes/vimium,poacher2k/vimium,cyrixhero/vimium,borgified/vimium,smblott-github/vimium,borgified/vimium,philc/vimium,VPashkov/vimium,elegantwww/vimium,zhangmin510/vimium,decaffeinate-examples/vimium,wildeyes/vimium,hhsue/vimium,Aleroniponi/vimium,PickRelated/vimium,smblott-github/vimium,Robinson10240/vimium,douglas-larocca/vimium,tuchangwei/vimium,gdh1995/vimium,justalittlenoob/vimium,bkudria/vimium,elderbas/vimium,zhangmin510/vimium,poacher2k/vimium,gdh1995/vimium,crazypenguincode/vimium,Aleroniponi/vimium,csmalin/vimium,dimatter/vimium,cyrixhero/vimium,justalittlenoob/vimium,decaffeinate-examples/vimium,tuchangwei/vimium,Lw-Cui/vimium,willsALMANJ/vimium,bkudria/vimium,hhsue/vimium,decaffeinate-examples/vimium,wildeyes/vimium,willsALMANJ/vimium,crazypenguincode/vimium,justalittlenoob/vimium,bkudria/vimium,dimatter/vimium,VPashkov/vimium