fix rubberband bounce on OSX and iOS
fix rubberband bounce on OSX and iOS

vector-im/riot-web,martindale/vector,KentShikama/vector-web,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,pvagner/vector-web,vector-im/vector-web,vector-im/riot-web,KentShikama/vector-web,martindale/vector,KentShikama/vector-web,vector-im/riot-web,vector-im/vector-web,KentShikama/vector-web,pvagner/vector-web,vector-im/riot-web,vector-im/riot-web,KentShikama/vector-web,KentShikama/vector-web