Fix show number redirects

[RatulMaharaj]

Purpose

This PR fixes #1174 by changing the route parameter [number=show_number] to just [show_number].

Also fixes a small typo which was causing an error to be thrown when redirecting for invalid show_number values.

[vercel]

@RatulMaharaj is attempting to deploy a commit to the Syntax Team on Vercel.

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ **PrismaClientValidationError: ** load(src/routes/(site)/[show_number]/+page.server) View Issue

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