George Ampartzidis

I created a pull request fixing the issue, as shown [here](https://github.com/udacity/AdvancedAndroid_MyGarden/pull/15/commits/8a88f9dde6b3e741353bd088fbcebe37f599ab1f)

Here's a screenshot of the activity_plan_detail. xml after the fix 

#Edit: it seems that importing the android.support.v4.media.app.NotificationCompat.MediaStyle isn't necessary, so we only have to change the setStyle part. However, although the notification is shown, the notifications actions are not working.

This is weird - I'm doing the following: ``` val allScreens = RallyScreen.entries //mock the screens var selectedScreen: RallyScreen? = null composeTestRule.setContent { RallyTheme { RallyTopAppBar( allScreens = allScreens, onTabSelected...