Change animation-leash to be a container layer

Temporary revert to fix flicker issues.

Bug: b/149792636, b/150829791
Test: go/wm-smoke
Change-Id: I016dfd937ea844f0687195d1670471dfdcbd8cdd

services/core/java/com/android/server/wm/SurfaceAnimator.java

@@ -379,10 +379,8 @@ class SurfaceAnimator {
         final SurfaceControl.Builder builder = animatable.makeAnimationLeash()
                 .setParent(animatable.getAnimationLeashParent())
                 .setHidden(hidden)
-                .setName(surface + " - animation-leash")
-                .setColorLayer();
+                .setName(surface + " - animation-leash");
         final SurfaceControl leash = builder.build();
-        t.unsetColor(leash);
         t.setWindowCrop(leash, width, height);
         t.setPosition(leash, x, y);
         t.show(leash);