Fix null mControlBarScrim crash

In a recent CL we allowed mControlBarScrim to be null and added null
check, but we forgot to delete obselete code.
Bug: 142277366
Test: manual

Change-Id: I6e956f041d5bd76998a620076bee123144a2563f
diff --git a/src/com/android/car/media/PlaybackFragment.java b/src/com/android/car/media/PlaybackFragment.java
index 75efde2..445daa4 100644
--- a/src/com/android/car/media/PlaybackFragment.java
+++ b/src/com/android/car/media/PlaybackFragment.java
@@ -394,7 +394,6 @@
             }
 
             if (expanding) {
-                ViewUtils.showViewAnimated(mControlBarScrim, millis);
                 if (mShowLinearProgressBar) {
                     ViewUtils.hideViewAnimated(mSeekBar, millis);
                 }
@@ -402,7 +401,6 @@
                     ViewUtils.showViewAnimated(mControlBarScrim, millis);
                 }
             } else {
-                ViewUtils.hideViewAnimated(mControlBarScrim, millis);
                 if (mShowLinearProgressBar) {
                     ViewUtils.showViewAnimated(mSeekBar, millis);
                 }