Remove unused profiles from offline event receipts

[larssandergreen]

Overview

Offline event receipts can't actually show any profile fields, as these are not used from the back office — so we can remove them from the message templates.

[civibot]

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[eileenmcnaughton]

@larssandergreen I just got this straight enough in my head to merge it - only to find it is now stale

I checked & yes other than this the offline forms do not show customPre or customPost which are the Profile field groups. OTOH the offline forms show all the custom fields & the online ones don't

FWIW I think the best approach is to make consistent variables available on both online & offline - but this PR (when not stale) will make that easier / more predictable to work towards

[eileenmcnaughton]

Not sure if the tests are gonna come right here - but I've added merge-on-pass in the hope they do