Don't allow starting DeveloperOptionsFragment on non-debug builds

Test: adb shell am start -n com.google.android.apps.nexuslauncher/com.android.launcher3.settings.SettingsActivity --es ":settings:fragment" "com.android.launcher3.settings.DeveloperOptionsFragment"
Fixes: 199302659
Change-Id: I33dd4db3444c0ccabbe4dc3bb80db4167aec6a03
diff --git a/src/com/android/launcher3/settings/SettingsActivity.java b/src/com/android/launcher3/settings/SettingsActivity.java
index 915e140..f348a33 100644
--- a/src/com/android/launcher3/settings/SettingsActivity.java
+++ b/src/com/android/launcher3/settings/SettingsActivity.java
@@ -62,8 +62,9 @@
         SharedPreferences.OnSharedPreferenceChangeListener{
 
     /** List of fragments that can be hosted by this activity. */
-    private static final List<String> VALID_PREFERENCE_FRAGMENTS = Collections.singletonList(
-            DeveloperOptionsFragment.class.getName());
+    private static final List<String> VALID_PREFERENCE_FRAGMENTS =
+            !Utilities.IS_DEBUG_DEVICE ? Collections.emptyList()
+                    : Collections.singletonList(DeveloperOptionsFragment.class.getName());
 
     private static final String DEVELOPER_OPTIONS_KEY = "pref_developer_options";
     private static final String FLAGS_PREFERENCE_KEY = "flag_toggler";