fix: Fix aliases for parameters

Issue-mkdocstrings-813: mkdocstrings/mkdocstrings#813

Author: pawamoy

src/mkdocstrings_handlers/python/_internal/handler.py

@@ -330,7 +330,7 @@ def get_aliases(self, identifier: str) -> tuple[str, ...]:
         """
         if "(" in identifier:
             identifier, parameter = identifier.split("(", 1)
-            parameter.removesuffix(")")
+            parameter = parameter.removesuffix(")")
         else:
             parameter = ""
         try: