DB/Creature: Fix another trigger visible to players
DB/Creature: Delete some double spawns

Updates #1515
DB/Reputation: Fix Oracle and Frenzyheart Tribe reputation

Closes #11106
Core/LFR: Fix a theoretical error with item_level
Despite the check never happening (player->GetAverageItemLevel() < 0 is impossible), it is more efficient.
Also improves codestyle consistency. Original fix by @emsy.
Merge pull request #11616 from Ascathor/master

Core/LFR: Fix a theoretical error with item_level
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore