Resets All Apps pullback alpha on state change.

Previously the progress alpha was updated, but in some cases (e.g.
0 animation speed), the final alpha was not always applied to the
pullback property.

Fix: 243015279
Test: Disable animations, swipe up to all apps, swipe up nav bar
to close, swipe up to all apps again. Alpha is now properly set.
(See b/232536048#comment49).

Change-Id: Ifb8a4cd3ee7cc94a5851d355fdf52860366b8f2f

src/com/android/launcher3/allapps/AllAppsTransitionController.java

@@ -406,6 +406,8 @@ public class AllAppsTransitionController
         Interpolator allAppsFade = config.getInterpolator(ANIM_ALL_APPS_FADE, LINEAR);
         setter.setFloat(getAppsViewProgressAlpha(), MultiPropertyFactory.MULTI_PROPERTY_VALUE,
                 hasAllAppsContent ? 1 : 0, allAppsFade);
+        setter.setFloat(getAppsViewPullbackAlpha(), MultiPropertyFactory.MULTI_PROPERTY_VALUE,
+                hasAllAppsContent ? 1 : 0, allAppsFade);
 
         boolean shouldProtectHeader =
                 ALL_APPS == state || mLauncher.getStateManager().getState() == ALL_APPS;