Virtual Keyboard: Further DPI Scaling Work

* Use layoutScale and pixmapScale from IMEDataInterface to:
    Scale Phone Keyboard layout
    Scale Phone Keyboard font sizes
    Scale Ellipsis font size for both keyboards

* Add safety net corner-scaling to IMEPixmap
  (Prevent rendering issues when key area < corner area)
* Correct spelling of FRAGMENT in IMEPixmap
* Move commented-out IMEPixmap debug methods
  (They function correctly when uncommented now)

Open-WebOS-DCO-1.0-Signed-Off-By: Josh Palmer <jpalmerwatkins@me.com>