Don't use library monitor for internal folders

MediaBrowser.Server.Implementations/IO/LibraryMonitor.cs

@@ -174,6 +174,11 @@ namespace MediaBrowser.Server.Implementations.IO
 
         private bool IsLibraryMonitorEnabaled(BaseItem item)
         {
+            if (item is BasePluginFolder)
+            {
+                return false;
+            }
+
             var options = LibraryManager.GetLibraryOptions(item);
 
             if (options != null)