Fix linting

Author: Michael Dayan

heudiconv/parser.py

@@ -279,9 +279,8 @@ def infotoids(
             lgr.info("Study session for %r", study_session_info)
 
             if grouping != "all":
-                assert (
-                        study_session_info not in study_sessions
-                    ), f"Existing study session {study_session_info} already in analyzed sessions {study_sessions.keys()}"
-                
+                assert (study_session_info not in study_sessions), (
+                    f"Existing study session {study_session_info} "
+                    f"already in analyzed sessions {study_sessions.keys()}")
             study_sessions[study_session_info] = seqinfo
     return study_sessions