admin/upgrade.php: Make installer jump to the bottom of the page when install is done

Bug1195489

Change-Id: I3d567f85bedfb92e0105e969d1770cd4e38413b5

htdocs/admin/upgrade.php

@@ -150,6 +150,7 @@ $js = <<< EOJS
 
                 if (!element) {
                     $('finished').style.visibility = 'visible';
+                    window.scrollTo(0, 5000000);
                     return; // done
                 }