Cancel unocclude animation on main thread

- It throws an exception since it's not being called on a looper thread

Bug: 251481696
Test: atest SystemUITests
Change-Id: I407bbcc2824ef4d6130c269551a6e0e7995896d7

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -987,9 +987,11 @@ public class KeyguardViewMediator extends CoreStartable implements Dumpable,
 
                 @Override
                 public void onAnimationCancelled(boolean isKeyguardOccluded) {
-                    if (mUnoccludeAnimator != null) {
-                        mUnoccludeAnimator.cancel();
-                    }
+                    mContext.getMainExecutor().execute(() -> {
+                        if (mUnoccludeAnimator != null) {
+                            mUnoccludeAnimator.cancel();
+                        }
+                    });
 
                     setOccluded(isKeyguardOccluded /* isOccluded */, false /* animate */);
                     Log.d(TAG, "Unocclude animation cancelled. Occluded state is now: "