Fix regression in notification deliverability (#1659)

* Fix regression in notification deliverability. Closes #1641
    * Only master tabs were showing notifications
* Only play the notification sound in the master tab
* Clears notification form after notification submission
* Add notification to admin notification list after creation. Closes #1651 
* Remove `console.log` statements from minified production JS

webpack.config.js

@@ -123,7 +123,12 @@ function getJSConfig(root, type, entries, mode) {
         new UglifyJsPlugin({
             cache: true,
             parallel: true,
-            sourceMap: true
+            uglifyOptions: {
+              compress: {
+                // Remove console.log in production
+                drop_console: mode === 'production'
+              },
+            },
         }),
       ],
     },