Hide overlay if the overlay was shown when Meta key is tapped.

Before fix : https://b.corp.google.com/issues/300492676#comment13
When Meta key is tapped in -1 screen, the toggleAllAppsFromIntent is called and
AllApps Drawer is shown in home screen. But the user is still in -1 screen.

After fix: https://b.corp.google.com/issues/300492676#comment15
When meta key is tapped in -1 screen, we hide -1 screen and transition
to 0 screen and then show AllAppsDrawer.

Bug: 300492676
Test: Manual, https://b.corp.google.com/issues/300492676#comment15
Flag: NA

Change-Id: I1234e4defdd0b53be35271b9f7567b0719eec7ac

src/com/android/launcher3/Launcher.java

@@ -1605,6 +1605,9 @@ public class Launcher extends StatefulActivity<LauncherState>
         if (getStateManager().isInStableState(ALL_APPS)) {
             getStateManager().goToState(NORMAL, alreadyOnHome);
         } else {
+            if (mWorkspace.isOverlayShown()) {
+                mOverlayManager.hideOverlay(/* animate */true);
+            }
             AbstractFloatingView.closeAllOpenViews(this);
             getStateManager().goToState(ALL_APPS, true /* animated */,
                     new AnimationSuccessListener() {