Initialize quickswitch rotation state

- The global listener checks mStartingQuickSwitchRotation
  before setting the override sampling region, but immediately
  after navigation mode switch, this is not set to -1 so we can
  end up setting this to the wrong region.

Bug: 158663687
Test: atest android.systemui.cts.LightBarTests#testLightNavigationBar
Change-Id: I332982b5401fa5d4d4af8cd4e4d71ab8beb6cd4d

packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java

@@ -221,7 +221,7 @@ public class NavigationBarFragment extends LifecycleFragment implements Callback
      */
     private VerticalNavigationHandle mOrientationHandle;
     private WindowManager.LayoutParams mOrientationParams;
-    private int mStartingQuickSwitchRotation;
+    private int mStartingQuickSwitchRotation = -1;
     private int mCurrentRotation;
     private ViewTreeObserver.OnGlobalLayoutListener mOrientationHandleGlobalLayoutListener;
     private UiEventLogger mUiEventLogger;