SpotifyRecorder: escape backslashes in filenames

SpotifyRecorder.py

@@ -185,6 +185,7 @@ class SpotifyRecorder:
         artists = self.__join_artists(track)
         fileName = f'{index} - {artists} - {track["track"]["name"]}'
         fileName = fileName.replace('/', '_')
+        fileName = fileName.replace('\\', '_')
         fileName = fileName.replace('"', '')
         fileName = fileName.replace(':', '_')
         fileName = fileName.replace('*', '_')