Fix fragment flickering on hiding (support library)

The "loadAnimation" method inside of the "hideFragment" method was called with "enter" argument set to "true". That's clearly a mistake. There is entry for this bug in issue tracker (http://code.google.com/p/android/issues/detail?id=32405)

Change-Id: I826c7c668f223dbf1b3fbd0b82f7084c5657649c