parameterized.expand lost orignal function line number

[wangkun611]

parameterized/parameterized/parameterized.py

Line 600 in b9f6a64

frame_locals[name] = cls.param_as_standalone_func(p, nf, name)

frame_locals[name] = wraps(f)(cls.param_as_standalone_func(p, nf, name))

The problem can be fixed by the above snippet. But I don't know if it will introduce new problems.