remove effort of pydantic v1

Author: John Lyu

sqlmodel/_compat.py

@@ -606,5 +606,3 @@ def sqlmodel_init(*, self: "SQLModel", data: Dict[str, Any]) -> None:
             for key in non_pydantic_keys:
                 if key in self.__sqlmodel_relationships__:
                     setattr(self, key, data[key])
-        # Override polymorphic_on default value
-        set_polymorphic_default_value(self, values)