gui: Slightly lighten the dark theme
gui: Slightly lighten the dark theme

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GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3605

uok/syncthing,kamadak/syncthing,syncthing/syncthing,Kudalufi/syncthing,cherylquirion/syncthing,nrm21/syncthing,ProactiveServices/syncthing,brgmnn/syncthing,syncthing/syncthing,Kudalufi/syncthing,nrm21/syncthing,kamadak/syncthing,rumpelsepp/syncthing,kluppy/syncthing,wweich/syncthing,imsodin/syncthing,xduugu/syncthing,lkwg82/syncthing,kluppy/syncthing,wweich/syncthing,wweich/syncthing,AudriusButkevicius/syncthing,imsodin/syncthing,le9i0nx/syncthing,jryans/syncthing,AudriusButkevicius/syncthing,imsodin/syncthing,le9i0nx/syncthing,lkwg82/syncthing,nrm21/syncthing,plouj/syncthing,ProactiveServices/syncthing,Kudalufi/syncthing,kluppy/syncthing,ProactiveServices/syncthing,brgmnn/syncthing,plouj/syncthing,kamadak/syncthing,nrm21/syncthing,imsodin/syncthing,Kudalufi/syncthing,AudriusButkevicius/syncthing,uok/syncthing,xduugu/syncthing,syncthing/syncthing,wweich/syncthing,xduugu/syncthing,plouj/syncthing,jryans/syncthing,xduugu/syncthing,cherylquirion/syncthing,kluppy/syncthing,brgmnn/syncthing,le9i0nx/syncthing,syncthing/syncthing,syncthing/syncthing,le9i0nx/syncthing,ProactiveServices/syncthing,rumpelsepp/syncthing,lkwg82/syncthing,brgmnn/syncthing,rumpelsepp/syncthing,imsodin/syncthing,lkwg82/syncthing,uok/syncthing,plouj/syncthing,cherylquirion/syncthing,cherylquirion/syncthing,syncthing/syncthing,rumpelsepp/syncthing,uok/syncthing,jryans/syncthing,kamadak/syncthing,jryans/syncthing,AudriusButkevicius/syncthing