Restore AllAppsContainerView UI to match spec.

Did some refactoring with Sunny's help.

Change-Id: Ie4c90c316f1e381829836e11c83eaaedfed4d621
diff --git a/res/layout-sw720dp/launcher.xml b/res/layout-sw720dp/launcher.xml
index 12c01b7..06cb550 100644
--- a/res/layout-sw720dp/launcher.xml
+++ b/res/layout-sw720dp/launcher.xml
@@ -76,8 +76,7 @@
             android:id="@+id/apps_view"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:visibility="invisible"
-           launcher:layout_ignoreInsets="true" />
+            android:visibility="invisible" />
     </com.android.launcher3.dragndrop.DragLayer>
 
 </com.android.launcher3.LauncherRootView>