Fix no-untyped-def in livestatus helper

Change-Id: Id91c09035db3a87c903214271a6186b57f1c7bd8

Author: LarsMichelsen

cmk/gui/data_source/livestatus.py

@@ -76,9 +76,7 @@ def _prepare_columns(
         # columns to allow for repeatable tests.
         return [c for c in sorted(columns) if c not in datasource.add_columns], dynamic_columns
 
-    def create_livestatus_query(  # type: ignore[no-untyped-def]
-        self, columns: Sequence[LivestatusColumn], headers
-    ) -> Query:
+    def create_livestatus_query(self, columns: Sequence[LivestatusColumn], headers: str) -> Query:
         return Query(QuerySpecification(table=self.table_name, columns=columns, headers=headers))
 
     def query(