hyperpipe_config.json contains invalid entry if cached SVC is used

[julblanke]

If cached SVC is used, the .json contains invalid entry ""__photon_type": "FileSystemStoreBackend"" which results in error when calling reload_hyperpipe-function in hyperpipe.py

Error:
.../photonai/base/json_transformer.py", line 72, in str_to_class
ValueError: Json Transformer is not able to initialize the hyperpipe. Class: FileSystemStoreBackend is not defined.