Use .__wrapped__ instead of a .original

[Andrew-S-Rosen]

When creating a Job, jobflow checks to see if the function is wrapped by looking for a custom-made .original attribute. This should be the same as the already-created .__wrapped__ attribute from @functools.wraps() so we should just use that.

import jobflow as jf

@jf.job
def add(a, b):
    return a+b

assert add.__wrapped__ == add.original

The above indicates that they are the same.

Sadly, I don't know where I'm going wrong though in this PR :( I'm probably not understanding the logic fully...