fix(Core/Creature): Fire Elemental Invasion changes (#9372)

* fix(DB): Blazing elemental invasion event

- Fixed Elemental Invader's SmartAI;
- Re-arranged Elemental Rifts SmartAI for controlled spawning of
  Invaders.

* SmartAI: SetCounter to be able to subtract

* Target unit or summoner changed for worldobjects

* extra checks and last sql file

* Codestyle

* codestyle

* adding Baron to elemental invasions

* changed owner or summoner target (SmartAI)

* codestyle

src/server/game/AI/SmartScripts/SmartScriptMgr.h

@@ -1005,6 +1005,7 @@ struct SmartAction
             uint32 counterId;
             uint32 value;
             uint32 reset;
+            uint32 subtract;
         } setCounter;
 
         struct