Stop worrying about what “looks good.”
To put it simply:
If you take the class and do well, they won’t care,
If you take the class and get blow a C, you could get a possible acceptance rescinded.
You have nothing to gain and potentially everything to lose. All for a class you don’t need to do, and a class you don’t need to worry or stress about.
If you want to take it because you’re genuinely interested in the subject, then by all means take it, but clearly that’s the not the case when you’re worrying about “looking good.”