Magnifier not respecting RTL/LTR direction and keyguard dialogs not properly centered.

1. When magnifier, if a dialog that popped up is wider than the scree we pan to its upper
   left corner. We now show the upper right corner if the locale direction is RTL.

2. Keyguard dialogs are not centered since they are used as a sign to recompute the
   magnified area but an unnecessary else statement prevents such dialogs from being
   properly show via a pan.

bug:7374331

Change-Id: I285e46b822a29f0082c502cb642f9da32dabfe6a