Fix minor UI bug.
Fix minor UI bug.

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