WET-BOEW Menu plugin: removed stray div end-tag

createMobilePanelMenu appends a div end-tag to its generated content,
but includes no associated div start-tag.  Mobile menu initialization 
fails when page is served as application/xhtml+xml

src/plugins/menu/menu.js

@@ -204,7 +204,7 @@ var componentName = "wb-menu",
 				sectionHtml + "</ul></nav>";
 		}
 
-		return panel.replace( /['"]?list-group-item['"]?/gi, "\"\"" ) + "</div>";
+		return panel.replace( /['"]?list-group-item['"]?/gi, "\"\"" );
 	},
 
 	/**