Stop layout reset by setting empty locale list.

Do not call Configuration.setLocales(empty LocaleList) if the locale
list is empty since Configuration.setLocales calls setLayoutDirection
which resets the layout to LTR.

Bug: 27411138
Change-Id: I7fa9693cdb7ed90267f074812c26ea50314ad839

core/java/android/provider/Settings.java

@@ -2093,7 +2093,7 @@ public final class Settings {
          */
         public static void clearConfiguration(Configuration inoutConfig) {
             inoutConfig.fontScale = 0;
-            if (!inoutConfig.userSetLocale) {
+            if (!inoutConfig.userSetLocale && !inoutConfig.getLocales().isEmpty()) {
                 inoutConfig.setLocales(LocaleList.getEmptyLocaleList());
             }
         }