Reset ongoing animation when opening menu

  Bug: 8687199

The XFade animation was not reset and yielded a transparent alpha

Change-Id: Ie2e43eccb2b4351ebf7d00075c567950ca6b2967
diff --git a/src/com/android/camera/ui/PieRenderer.java b/src/com/android/camera/ui/PieRenderer.java
index bd3c2f7..9edc111 100644
--- a/src/com/android/camera/ui/PieRenderer.java
+++ b/src/com/android/camera/ui/PieRenderer.java
@@ -268,6 +268,9 @@
      */
     private void show(boolean show) {
         if (show) {
+            if (mXFade != null) {
+                mXFade.cancel();
+            }
             mState = STATE_PIE;
             // ensure clean state
             mCurrentItem = null;