only add done button if vc was presented modally
only add done button if vc was presented modally

x2on/FSImageViewer,sirajudheen53/FSImageViewer,iwakevin/FSImageViewer,shenhzou654321/FSImageViewer,yichizhang/FSImageViewer,ListFranz/FSImageViewer,imjerrybao/FSImageViewer,harlanhaskins/FSImageViewer,freshbrix/FSImageViewer,arsalananwar/FSImageViewer,tooploox/FSImageViewer,Voxer/FSImageViewer