Fix group amount_refunded model check (#2389)
Fix group amount_refunded model check (#2389)

* Fix group amount_refunded model check
It's unclear how this wasn't caught in the first place, but this model check was always returning an error even when inappropriate.

* Clean up group money model check to be clearer

magfest/ubersystem,RAMSProject/rams,magfest/ubersystem,magfest/ubersystem,magfest/ubersystem,RAMSProject/rams,RAMSProject/rams