Add missing ACTION_MEDIA_UNMOUNTED intent

When an SD card is removed without the user unmounting, the intent
ACTION_MEDIA_BAD_REMOVAL is fired but is missing the preceeding
ACTION_MEDIA_UNMOUNTED which is needed to keep UI consistency.
Now when bad media removal is detected an ACTION_MEDIA_UNMOUNTED
intent is sent before the ACTION_MEDIA_BAD_REMOVAL.

Signed-off-by: task650 <task650@gmail.com>