Rename dev settings menu preferences file as it conflicts with fennec…

…'s (facebook#23123)

Summary:
On Android, resources with the same name from different libraries conflict, so it's encouraged to have prefixes for resource names.

This is one case where the settings menu preferences file in firefox for android is called `preferences.xml` so it conflicts with the dev support settings menu for react native.

when integrating react-native to the firefox project, react native dev settings menu never shows, and the one from firefox shows up instead.

This a link to a file from a fork project that I'm working on:
https://github.com/ghostery/browser-android/blob/master/mozilla-release/mobile/android/app/src/main/res/xml/preferences.xml

Please, let me know, if anything more needs to be changed

Changelog:
-----------
[Android] [Fixed] Rename dev settings menu preferences file with a RN prefix.
Pull Request resolved: facebook#23123

Differential Revision: D13781836

Pulled By: cpojer

fbshipit-source-id: f27483d4eca5aa4148759b94b601673985c5aa91

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSettingsActivity.java

@@ -23,6 +23,6 @@ public class DevSettingsActivity extends PreferenceActivity {
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setTitle(getApplication().getResources().getString(R.string.catalyst_settings_title));
-    addPreferencesFromResource(R.xml.preferences);
+    addPreferencesFromResource(R.xml.rn_dev_preferences);
   }
 }