[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

mne_bids/path.py

@@ -2548,7 +2548,7 @@ def _return_root_paths(root, datatype=None, ignore_json=True, ignore_nosub=False
     else:
         if datatype is not None:
             datatype = _ensure_tuple(datatype)
-            search_str = f'**/{"|".join(datatype)}/*'
+            search_str = f"**/{'|'.join(datatype)}/*"
 
             # I think this one is more appropriate
             search_str = search_str + ".*"