[FIX] for BFDParticipant>>popUpBillboard

On CroquetSource repository PublicContributions.

From the package description:

Name: HedgeHacks-BFD-daf.35
Author: daf
Time: 16 July 2006, 2:41:27 pm
UUID: d4d26ce0-1939-d84d-ae97-376497db766e
Ancestors: HedgeHacks-BFD-bgf.34

small fix for BFDParticipant>>popUpBillboard to position it properly
in front of the avatar.