Fix issue with all apps icons not being aligned

-> The new versions of LayoutManagers in the latest support lib
   has begun to respect certain layout params (where before they
   were ignoreed). match_parent is now treated as "match column",
   which is what we want here.

issue 27581978

Change-Id: If1efed15b5a93c873ff141e3c658922819c143fb

res/layout/all_apps_icon.xml

@@ -18,7 +18,7 @@
     xmlns:launcher="http://schemas.android.com/apk/res-auto"
     style="@style/Icon.AllApps"
     android:id="@+id/icon"
-    android:layout_width="wrap_content"
+    android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_gravity="center"
     android:paddingTop="@dimen/all_apps_icon_top_bottom_padding"