BUGFIX: Don't include the current registration in the overall capacity calculations.
BUGFIX: Don't include the current registration in the overall capacity calculations.

stephenmcm/silverstripe-eventmanagement,souldigital/silverstripe-eventmanagement,stephenmcm/silverstripe-eventmanagement,burnbright/silverstripe-eventmanagement,registripe/registripe-core,burnbright/silverstripe-eventmanagement,souldigital/silverstripe-eventmanagement,silverstripe-australia/silverstripe-eventmanagement,silverstripe-australia/silverstripe-eventmanagement