Revert notification toolbar setting

It isn't a setting.

Signed-off-by: Travis Ralston <travpc@gmail.com>

src/settings/Settings.js

@@ -236,8 +236,4 @@ export const SETTINGS = {
         default: true,
         controller: new AudioNotificationsEnabledController(),
     },
-    "notificationToolbarHidden": {
-        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
-        default: false,
-    },
 };