SystemUI: Make the HSPA+ drawables more consistent with the HSPA drawables

Though the older HSPA+ drawables are sharper, that makes them look
out of place in comparison with the HSPA drawables.

Change-Id: I76313ae0125b3a8fda928b240f33715e48f77867

Conflicts:

	packages/SystemUI/res/drawable-hdpi/stat_sys_data_fully_connected_hp.png
	packages/SystemUI/res/drawable-mdpi/stat_sys_data_fully_connected_hp.png