Revert "ApnSettingsActivity shows the ActionBar"

This reverts commit 5a7f5a09310e75d2e13fb0d4e7dda99f0b4662ef.

Reason for revert: seems to cause b/331379466 according to the culprit range search

Change-Id: I6ab2474864d43a1a8bcb50de5bc9ab5c0ac08f4e
Bug: 331379466
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 852d82c..19e774c 100644
--- a/AndroidManifest.xml
+++ b/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.NoActionBar"
+            android:theme="@style/Theme.Settings"
             android:hardwareAccelerated="true"
             android:requiredForAllUsers="true"
             android:supportsRtl="true"