ApnSettingsActivity shows the ActionBar

- Use the Theme.Settings.NoActionBar
- Settings use the CollapsingToolbar and
  don't need the old style toolbar.

Fixes: 331308440
Test: manual test
Change-Id: Ieb9acd858f5a8993f30547c3c8c3c2ab3a5865af

AndroidManifest.xml

@@ -152,7 +152,7 @@
             android:name=".SettingsApplication"
             android:label="@string/settings_label"
             android:icon="@drawable/ic_launcher_settings"
-            android:theme="@style/Theme.Settings"
+            android:theme="@style/Theme.Settings.NoActionBar"
             android:hardwareAccelerated="true"
             android:requiredForAllUsers="true"
             android:supportsRtl="true"