HALO: Fix memory leaks

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/HaloProperties.java

Change-Id: I8cc1a0c4f33f2e1895c1026d90dc8b6cad319e0b

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/HaloProperties.java