frameworks: base: systemui: remove textSize from dock_battery_text

* Having this option set caused the text size to differ between
  dock_battery_text and battery_text when using the percentage
  battery mod.

Change-Id: Ifb58d4be08d2fc547fe74574dbd9d8d6bd279ede
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1-linaro