tests: enable revpi-connect-4 in automated tests

[rcooke-warwick]

The revpi-connect-4 was found to have connectivity issues with the autokit wifi AP - which were resolved by configuring it to use the external antenna - even if no antenna was connected. It is thought that there was EMI or signal power issues.

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[rcooke-warwick]

@resin-jenkins retest this please

[rcooke-warwick]

@balena-ci I self-certify!