Fixed a bug that maxDoubleTapZoomScale is larger than maxScale, so that double tap zoom out never works in some cases.
Fixed a bug that maxDoubleTapZoomScale is larger than maxScale, so that double tap zoom out never works in some cases.

ideaismobile/IDMPhotoBrowser,EricTYHuang/IDMPhotoBrowser,oliveroneill/OOPhotoBrowser,thiagoperes/IDMPhotoBrowser,0xdatou/IDMPhotoBrowser,ideaismobile/IDMPhotoBrowser