Fix analysis backlog calculation for specific path on storage

We need to convert the provided path into a local storage one first,
otherwise the following scandir calls will fall on their faces.

src/octoprint/filemanager/storage.py

@@ -489,6 +489,9 @@ class LocalFileStorage(StorageInterface):
 		return self.analysis_backlog_for_path()
 
 	def analysis_backlog_for_path(self, path=None):
+		if path:
+			path = self.sanitize_path(path)
+
 		for entry in self._analysis_backlog_generator(path):
 			yield entry