overviewmap needs to set fallThrough to false (Closes #1333)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6052 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/OverviewMap.js

@@ -434,7 +434,8 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
     createMap: function() {
         // create the overview map
         var options = OpenLayers.Util.extend(
-                        {controls: [], maxResolution: 'auto'}, this.mapOptions);
+                        {controls: [], maxResolution: 'auto', 
+                         fallThrough: false}, this.mapOptions);
         this.ovmap = new OpenLayers.Map(this.mapDiv, options);
         
         // prevent ovmap from being destroyed when the page unloads, because