Increase spacing between icons in All Apps on tablets.

Change-Id: If90332098f749295da07f4faca707a7a6965666b
diff --git a/res/values-sw600dp/dimens.xml b/res/values-sw600dp/dimens.xml
index fb54f12..feb1a00 100644
--- a/res/values-sw600dp/dimens.xml
+++ b/res/values-sw600dp/dimens.xml
@@ -21,6 +21,7 @@
     <dimen name="all_apps_icon_top_bottom_padding">12dp</dimen>
     <dimen name="all_apps_background_canvas_width">850dp</dimen>
     <dimen name="all_apps_background_canvas_height">525dp</dimen>
+    <dimen name="all_apps_icon_width_gap">36dp</dimen>
 
 <!-- Cling -->
     <dimen name="cling_migration_logo_height">400dp</dimen>