Remove SurfaceView#setUseAlpha

Alpha on SurfaceView just works now.

Bug: 241474646
Test: builds
Change-Id: I545a6f64e797e127e35dc6183acb895af1bc37cc

libs/WindowManager/Shell/src/com/android/wm/shell/TaskView.java

@@ -109,7 +109,6 @@ public class TaskView extends SurfaceView implements SurfaceHolder.Callback,
         if (mTaskViewTransitions != null) {
             mTaskViewTransitions.addTaskView(this);
         }
-        setUseAlpha();
         getHolder().addCallback(this);
         mGuard.open("release");
     }

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleStackView.java

@@ -938,7 +938,6 @@ public class BubbleStackView extends FrameLayout
         addView(mAnimatingOutSurfaceContainer);
 
         mAnimatingOutSurfaceView = new SurfaceView(getContext());
-        mAnimatingOutSurfaceView.setUseAlpha();
         mAnimatingOutSurfaceView.setZOrderOnTop(true);
         boolean supportsRoundedCorners = ScreenDecorationsUtils.supportsRoundedCornersOnWindows(
                 mContext.getResources());