[Panlingual] Improve conditions of supporting app locale.

There are 3 conditions we need to check.
  1. Has locale config file
  2. Has locale config file w/o content
  3. Has locale config file w/ content

 Currently, we do not have condition 2 into the condition group, and we
 need to add it into.

Bug: b/243099750
Test: Manual
Change-Id: I58d0275af53031ba4f4c705022017d5143f45795

src/com/android/settings/applications/AppLocaleUtil.java

@@ -100,8 +100,8 @@ public class AppLocaleUtil {
      */
     public static boolean isAppLocaleSupported(Context context, String packageName) {
         LocaleList localeList = getPackageLocales(context, packageName);
-        if (localeList != null && localeList.size() > 0) {
-            return true;
+        if (localeList != null) {
+            return localeList.size() > 0;
         }
 
         if (FeatureFlagUtils.isEnabled(