`gw-zip-files.php`: Updated snippet to add support for merge tags in zip files.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2331036263/53520/

Summary

The Zip Files snippet to generate a zip of all uploaded files from the submitted entry does not support merge tags. This update adds support for it.

Update in action (~30 seconds): https://www.loom.com/share/63ad5a18b0d74c52a101edd91f75f976

[github-actions[bot]]

	Warnings
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