BUGFIX: fixed ForumPostersGroupID not saving. PATCH via mattclegg (#5857)
BUGFIX: fixed ForumPostersGroupID not saving. PATCH via mattclegg (#5857)

Olliepop/silverstripe-forum,mandrew/silverstripe-forum,Olliepop/silverstripe-forum,gordonbanderson/silverstripe-forum,camfindlay/silverstripe-forum,gordonbanderson/silverstripe-forum,camfindlay/silverstripe-forum,mandrew/silverstripe-forum