HALO: fix the integer division bug

The newHeight is calculated by an integer division, which leads to an
ugly bug. E.g. a 95x96 image will get a newHeight of 0 because
(95 / 96 * 113) equals to 0. This will lead to a SystemUI FC.

Fix it by multipling first and dividing afterwards.
HALO: batch message icon for hdpi and mdpi

It's hard to keep up with Paul hehe

Conflicts:
	packages/SystemUI/res/drawable-hdpi/halo_batch_message.png
	packages/SystemUI/res/drawable-mdpi/halo_batch_message.png

Change-Id: Ifbb2995da0b365a3298ec74576338b82747f054b
halo. what else, style changes

Change-Id: I8d82844c45edd3ce5f73bfed875b8df191defe11