Core/GameObject: Finish moving activation code of traps to GO_ACTIVATED

Fixing #6388 should be easier now...
Core/GameObject: Fix crash added in c6bf7e0b1d615a22c2145c6f4a757a10a9eca92c

Thanks @jackpoz
Remove unnecessary check in previous fix
DB/Creature: Fix incorrect flags_extra for 30413

By untaught, closes #12010
DB/Gossip: Remove "Jarin Dawnglow <Innkeeper>" double gossip
Closes #12019