drop redundant warning type

src/ms3/bs4_parser.py

@@ -2324,7 +2324,7 @@ def set_instrument(self, staff_id: Union[str, int], trackname):
                 damaged_dict[staff_id] = new_values["id"]
                 self.logger.warning(f'''You are trying to assign instruments {pformat(damaged_dict, width=1)} but they are belonging to the same part.
                 In order to assign two different instruments, you would have to split them in two parts in MuseScore.
-                For now, I'm assigning '{new_values["id"]}' to all of them.''', extra=dict(message_id=(33,)))
+                For now, I'm assigning '{new_values["id"]}' to all of them.''', extra=dict(message_id=(31,)))
             else:
                 different_values_set = \
                 np.where([new_values["id"] != self.fields[staff_key]["id"] for staff_key in staves_within_part])[

src/ms3/logger.py

@@ -56,7 +56,6 @@ class MessageType(Enum):
     CORRECTED_INSTRUMENT_TRACKNAME_WARNING = 30
     INCONSISTENT_INSTRUMENT_CHANGE_WITHIN_PART = 31
     FRICTIONLESS_VALIDATION_ERROR_WARNING = 32
-    INCONSISTENT_INSTRUMENT_CHANGE_WITHIN_PART_TO_UPDATE = 33