OmniControl: disable settings for navbar visibility

hopefully only tmp until 12.1 migration is done

Change-Id: I5e0e89497b2f9c534c1b7cd4808885c484c95da2
diff --git a/app/src/main/res/xml/bars_settings_preferences.xml b/app/src/main/res/xml/bars_settings_preferences.xml
index 4ca919e..e646ab2 100644
--- a/app/src/main/res/xml/bars_settings_preferences.xml
+++ b/app/src/main/res/xml/bars_settings_preferences.xml
@@ -23,11 +23,11 @@
         android:key="category_navigationbar"
         android:title="@string/navigationbar_title">
 
-        <org.omnirom.omnilib.preference.SystemSettingSwitchPreference
+        <!--<org.omnirom.omnilib.preference.SystemSettingSwitchPreference
             android:key="navbar_visibility"
             android:title="@string/navigation_bar_show_title"
             android:summary="@string/navigation_bar_show_summary"
-            android:defaultValue="true"/>
+        android:defaultValue="true"/>-->
 
         <org.omnirom.omnilib.preference.SystemSettingSwitchPreference
             android:key="navigation_bar_menu_arrow_keys"