Unify calls to get system locales list

app/src/main/java/org/fdroid/fdroid/FDroidApp.java

@@ -257,8 +257,7 @@ public class FDroidApp extends Application implements androidx.work.Configuratio
         FDroidDatabase db = DBHelper.getDb(context);
         Single.fromCallable(() -> {
             long now = System.currentTimeMillis();
-            LocaleListCompat locales =
-                    ConfigurationCompat.getLocales(Resources.getSystem().getConfiguration());
+            LocaleListCompat locales = App.getLocales();
             db.afterLocalesChanged(locales);
             Log.d(TAG, "Updating DB locales took: " + (System.currentTimeMillis() - now) + "ms");
             return true;