fix: --format outputs any string, --https only subsitute http URL scheme

[doodlesbykumbi]

resolves #3112

--format: outputs arbitrarily formatted strings
--https: https only substituted when the URL scheme is http

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: doodlesbykumbi
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[minikube-bot]

Can one of the admins verify this patch?

[tstromberg]

Looks good, but needs a test so that we don't accidentally regress this in the future. Do you mind adding one?

[doodlesbykumbi]

@tstromberg thanks. we're all set :)

[doodlesbykumbi]

/assign @balopat