Move optional color logic to prevent possible flicker.
Move optional color logic to prevent possible flicker.

FanPortal/JTSImageViewController,ElfSundae/JTSImageViewController,larcus94/JTSImageViewController,atone/JTSImageViewController,GeorgesAlkhouri/JTSImageViewController,caoer/JTSImageViewController,mattprowse/JTSImageViewController,ainopara/JTSImageViewController,jonesgithub/JTSImageViewController,Kingside/JTSImageViewController,tokorom/JTSImageViewController,iosphere/JTSImageViewController,IdeasOnCanvas/JTSImageViewController,lintaoSuper/JTSImageViewController,clooth/JTSImageViewController,jogabo/JTSImageViewController,Ethan-Z/JTSImageViewController,bulusoy/JTSImageViewController,mash/JTSImageViewController,ywzw2013/JTSImageViewController,hoanganh6491/JTSImageViewController,colemancda/JTSImageViewController,ello/JTSImageViewController,jaredsinclair/JTSImageViewController