Fix cancel animation invoke callback early

Removed the redundant finish behavior when the cancel animation is
running.

Bug: 259608500
Test: atest BackProgressAnimatorTest
Change-Id: Iceab5439c974268d1688d0c556c76cad33716249

libs/WindowManager/Shell/src/com/android/wm/shell/back/CrossActivityAnimation.java

@@ -370,13 +370,7 @@ class CrossActivityAnimation {
 
         @Override
         public void onBackCancelled() {
-            // End the fade in animation.
             mProgressAnimator.onBackCancelled(CrossActivityAnimation.this::finishAnimation);
-            mEnteringProgressSpring.cancel();
-            mLeavingProgressSpring.cancel();
-            // TODO (b259608500): Let BackProgressAnimator could play cancel animation.
-            mProgressAnimator.reset();
-            finishAnimation();
         }
 
         @Override