Remove confusing comment

I'm assuming that this is incorrect given that there _are_ arguments
where the comment suggests there aren't any.

test/test_inference/test_signature.py

@@ -273,8 +273,6 @@ def test_pow_signature(Script, environment):
             def x(f):
                 @functools.wraps(f)
                 def wrapper(*args):
-                    # Have no arguments here, but because of wraps, the signature
-                    # should still be f's.
                     return f(*args)
                 return wrapper