Remove magic paddings from bookmark view

 Use calculated sizes to correctly center without the need for
 "magic" padding values.

Change-Id: Ida64a80243df9bf05355dd1db1047fc16c10b726
diff --git a/res/values/integers.xml b/res/values/integers.xml
index ad0ed90..5a8c15f 100644
--- a/res/values/integers.xml
+++ b/res/values/integers.xml
@@ -27,4 +27,6 @@
     <integer name="comboViewFadeInDuration">400</integer>
     <!--  fade between tabs duration -->
     <integer name="tabFadeDuration">300</integer>
+    <!-- The maximum number of columns in the bookmark grid view -->
+    <integer name="max_bookmark_columns">5</integer>
 </resources>