Make subsettings display edge-to-edge

Fixes: 132182711
Test: visual
Change-Id: I3b0635cba359f74d463c2360323d80c5c9533228
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 8e62c45..0603796 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -164,7 +164,8 @@
         </receiver>
 
         <activity android:name=".SubSettings"
-                android:parentActivityName="Settings" />
+                android:parentActivityName="Settings"
+                android:theme="@style/Theme.SubSettings"/>
 
         <activity android:name=".Settings$CreateShortcutActivity"
                   android:label="@string/settings_shortcut">