Fixed oversight in r10430: the $Weapon class hook condition didn't work on $Weapon Collision hooks if the other object was an asteroid.

git-svn-id: svn://svn.icculus.org/fs2open@10474 387891d4-d844-0410-90c0-e4c51a9137d3
Bigger (and better?) Briefing and Debriefing editors courtesy of Axem. 

git-svn-id: svn://svn.icculus.org/fs2open@10475 387891d4-d844-0410-90c0-e4c51a9137d3