bottle.rb: fix typo in go regex

[danielnachun]

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[BrewTestBot]

Review period skipped due to critical label.

[danielnachun]

There was a typo introduced when I moved the regex for detecting the libexec prefix for go into the formula_ignores method. This breaks the regex and causes brew bottle to incorrectly flag all go dependents as non-relocatable. I'm not sure how many formulae were affected by this, but we should rebottle any that got the wrong cellar. Apologies for this breakage!

First identified here: Homebrew/homebrew-core@56dd835.

[danielnachun]

The tap syntax test for Linux fails because of #12319, which may need a new tag before it will be fixed. I'm not sure if auto-merge will work if that fails?