Revert "HALO: drawables are completely fucked"

This reverts commit cb215272aff55ac2db4512f16ef4efdc3a2d96f5.

Conflicts:
	packages/SystemUI/res/drawable-hdpi/halo_back_left.png
	packages/SystemUI/res/drawable-hdpi/halo_back_right.png
	packages/SystemUI/res/drawable-hdpi/halo_clear_all.png
	packages/SystemUI/res/drawable-hdpi/halo_dismiss.png
	packages/SystemUI/res/drawable-hdpi/halo_marker.png
	packages/SystemUI/res/drawable-hdpi/halo_silence.png
	packages/SystemUI/res/drawable-mdpi/halo_back_left.png
	packages/SystemUI/res/drawable-mdpi/halo_back_right.png
	packages/SystemUI/res/drawable-mdpi/halo_clear_all.png
	packages/SystemUI/res/drawable-mdpi/halo_dismiss.png
	packages/SystemUI/res/drawable-mdpi/halo_marker.png
	packages/SystemUI/res/drawable-mdpi/halo_silence.png