Making overview panel accessible via Tab

Keyboard navigation of AllAppsContainerView is broken in TOT; disabling
focusing there is necessary for Recents.

Bug: 72222505
Test: Manual
Change-Id: I85d544f7c8dbdaf12e49de51c6626bbc3dc32917
diff --git a/res/layout/all_apps.xml b/res/layout/all_apps.xml
index 5e7b117..02d793e 100644
--- a/res/layout/all_apps.xml
+++ b/res/layout/all_apps.xml
@@ -23,8 +23,7 @@
     android:layout_height="match_parent"
     android:clipChildren="true"
     android:clipToPadding="false"
-    android:focusable="true"
-    android:focusableInTouchMode="true"
+    android:focusable="false"
     android:saveEnabled="false" >
 
     <include layout="@layout/all_apps_rv_layout" />