Add webfonts reset functionality to the checkbox

Change-Id: I983d261fa018416c36ad2123b94850986beeca70

lib/jquery.webfonts.js

@@ -68,9 +68,8 @@
 		 * @param fontFamily String: font family name
 		 */
 		apply : function(fontFamily, $element) {
-			var fontStack;
 			$element = $element || this.$element;
-			fontStack = this.options.fontStack.slice(0);
+			var fontStack = this.options.fontStack.slice(0);
 			this.load(fontFamily);
 			fontStack.unshift(fontFamily);
 			$element.css('font-family', fontStack.join() );