Fix JS import/export syntax and align quotes

src/backends/widget.js

 import WidgetApi from 'matrix-widget-api';
 
-WidgetBackend = {};
+class WidgetBackend {
+}
+
+export default WidgetBackend;

webpack.config.js

@@ -13,7 +13,7 @@ module.exports = {
     }),
   ],
   output: {
-    filename: "augmentile-[name].bundle.js",
+    filename: 'augmentile-[name].bundle.js',
     path: path.resolve(__dirname, 'dist')
   }
 };