pull: Remove `--bottle` flag

- Muscle memory is a thing, as is relying heavily on one's shell
  history. Now that the Jenkins runners are gone, `brew pull --bottle`
  no longer works. This removes the option. If maintainers are confused,
  they should [look at recent changes to the
  docs](https://docs.brew.sh/Brew-Test-Bot-For-Core-Contributors#bottling),
  or ask in Slack.
- An earlier iteration of this showed a deprecation warning and a link
  to the docs, but when an option no longer physically works it's a bit
  late for deprecation *warnings*.
- This also fixes a `brew style` warning from futher up in the file.

pull: Appease RuboCop