fix: moves COPILOT_HOOKS_DENY_DEMO guard to ensure deny() in scope

[ohainle]

Why:

Closes: #43102

What's being changed (if available, include any code snippets, screenshots, or gifs):

This PR addresses the script failures discussed in #43102, amending the pre-tool-policy.sh bash example script listed at https://docs.github.com/en/copilot/tutorials/copilot-cli-hooks#example-script-bash.
By moving the COPILOT_HOOKS_DENY_DEMO guard to below the deny() declaration, we ensure that deny() is always in scope when invoked.

Note

This PR only addresses the bash examples, as I don't currently have access to a PowerShell environment to reproduce and confirm the issue on that end.

I'm happy for this PR to be hijacked and updated with PowerShell fixes, if convenient.
Otherwise, the issue should remain open until PowerShell examples have been investigated, and if necessary amended.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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