SystemUI: Fix data and activity overlay icons

This is just a temporary fix.
Better solution will be to use new vector format of drawables.

Change-Id: I2f27e5cedefefbf542fa9871d6dc125cb1420439
Signed-off-by: kecinzer <kecinzer@gmail.com>

Patchset: 2
http://review.cyanogenmod.org/#/c/78149/