SystemUI: Rework SearchPanelView calculations

Make isScreenLarge calculations match how the system calculates where to put the navigation
bar. This fixes certain cases where the quick launch buttons on the glowpad of the
navigation bar is improperly oriented.

Change-Id: I5703578b4d49a6eeab100bb23167abd5cf9a326d
Merge "SystemUI: Rework SearchPanelView calculations" into android-4.4