Core/Transports: Fixed crashes caused by invalid leftover transport references

Closes #12282
Core/Spells: Fix Leader of the Pack

Broken with 6b430db910c2cffe49dc1049661c111f164f94f5 because we used the wrong spell...
Merge pull request #12291 from Unholychick/patch-lotp

Core/Spells: Fix Leader of the Pack
DB/SpellGroups: Fix a couple of runtime DB errors from f27821486b0c38e0f92bc719c997f3e9435d7c59
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore

Conflicts fixed:
	src/server/game/Battlegrounds/Zones/BattlegroundIC.cpp