avoid extra lookup for notifications

Auditors: @jonathansampson

Author: cezaraugusto

js/components/main.js

@@ -738,7 +738,7 @@ class Main extends ImmutableComponent {
 
     const notifications = this.props.appState.get('notifications')
     const hasNotifications = notifications && notifications.size
-    const notificationBarOrigin = this.props.appState.get('notifications').map(bar => bar.get('frameOrigin'))
+    const notificationBarOrigin = notifications.map(bar => bar.get('frameOrigin'))
 
     return <div id='window'
       className={cx({
@@ -921,8 +921,7 @@ class Main extends ImmutableComponent {
         />
         {
           hasNotifications && activeFrame
-          ? <NotificationBar notifications={this.props.appState.get('notifications')}
-            activeFrame={activeFrame} />
+          ? <NotificationBar notifications={notifications} activeFrame={activeFrame} />
           : null
         }