oopsy: fix missed buff party tracking (#4579)
oopsy: fix missed buff party tracking (#4579)

The party mapping was cleared after a wipe, which would cause
missed buffs to no longer show up and leave "couldn't find owner"
console error messages.
quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot