wezterm: remove preflight block

[khipp]

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In the following questions <cask> is the token of the cask you're submitting.

After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online <cask> is error-free.
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This PR removes the need for the preflight block, as it is not run before the audit and therefore causes it to fail.