Set Smidge cachebuster type

[SimonHartfield]

Prerequisites

• I have added steps to test this contribution in the description below

This fixes : 15165

Description

Sets the cachebuster type for Smidge correctly, so that the version is correctly set on the URL

Testing

Replication steps for the bug from HQ are here:
#15165 (comment)

Set the smidge cache buster to AppDomain
Confirm that the version in the URLs is no longer 1

[github-actions]

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