Simplify Tap#custom_remote?.

[reitermarkus]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

Extracted from #16730 for easier review.

[apainintheneck]

Not sure this is really simpler.

[MikeMcQuaid]

Agreed. Find this hard to follow than the previous one and doesn't reduce branching. Sorry, passing on this.

[reitermarkus]

It's needed to work with the signature of Tap#remote, which is added in a later commit in the original PR.

[reitermarkus]

Feel free to suggest an alternative that only calls remote once.

[reitermarkus]

Also note that nonzero? returns nil instead of false.

[Bo98]

Feel free to suggest an alternative that only calls remote once.

return true unless (remote = self.remote) or similar?

[MikeMcQuaid]

Thanks again @reitermarkus!