Fix Select mode problem with animation off

- Avoid calling resetTaskVisuals when entering Modal state with animation off, it should only be called when leaving Overview, to be consistent with animation on case
- Use a separate property to control alpha for modalness, to avoid being overridden by other transition

Fix: 320314839
Test: presubmit
Flag: ACONFIG com.android.launcher3.enable_overview_icon_menu TEAMFOOD
Change-Id: I12a35682e25c3a70bc263afdc90a7895d6c56f11

quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java

@@ -69,6 +69,7 @@ public final class RecentsViewStateController extends
         super.setState(state);
         if (state.overviewUi) {
             mRecentsView.updateEmptyMessage();
+        } else {
             mRecentsView.resetTaskVisuals();
         }
         setAlphas(PropertySetter.NO_ANIM_PROPERTY_SETTER, new StateAnimationConfig(), state);