Fix fail_example.py

[shuttle1987]

When run outside the test runner you get this:

$ mypy tests/fail/fail_example.py 
tests/fail/fail_example.py:6: error: No overload variant of "int" matches argument type "Dict[Any, Any]"
tests/fail/fail_example.py:6: note: Possible overload variant:
tests/fail/fail_example.py:6: note:     def int(self, x: Union[str, bytes, SupportsInt] = ...) -> int
tests/fail/fail_example.py:6: note:     <1 more non-matching overload not shown>

When run in the test runner the lines starting with "note" cause problems with the tests.

            if "# E:" in target_line:
                marker = target_line.split("# E:")[-1].strip()
                assert lineno in errors, f'Extra error "{marker}"'
                assert marker in errors[lineno]
            else:
>               pytest.fail(f'Error {repr(errors[lineno])} not found')
E               Failed: Error 'tests/fail/fail_example.py:6: note:     def int(self, x: Union[str, unicode, bytearray], base: int = ...) -> int' not found