raidboss: fix Vanaspati Last Gasp trigger (#3780)
raidboss: fix Vanaspati Last Gasp trigger (#3780)

Fixes #3775.
quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot