Pie Controls: Fix snap points position.

This commit reverts an error, introduced by the second pie
service commit, which causes the positions where the snap points
gets displayed to be inverted.

Change-Id: Iedaf6d4773c9ae45fb685d724fad6c35ecdeddf0

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/pie/PieLayout.java
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