overview map control destroys drag handler too late, r=ahocevar (closes #2383)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9902 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/OverviewMap.js

@@ -144,6 +144,7 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
             return;
         }
         this.handlers.click.destroy();
+        this.handlers.drag.destroy();
 
         this.mapDiv.removeChild(this.extentRectangle);
         this.extentRectangle = null;