Do not replace locked fields

MediaBrowser.Providers/Manager/MetadataService.cs

@@ -1103,7 +1103,7 @@ namespace MediaBrowser.Providers.Manager
                     target.IsLocked = target.IsLocked || source.IsLocked;
                 }
 
-                if (replaceData || target.LockedFields.Length == 0)
+                if (target.LockedFields.Length == 0)
                 {
                     target.LockedFields = source.LockedFields;
                 }