[Cleanup] Remove _baseBotStance from bot.h (#3076)

# Notes
- This is unused.

zone/bot.cpp

@@ -8778,7 +8778,6 @@ void Bot::SetDefaultBotStance() {
 	if (GetClass() == WARRIOR)
 		defaultStance = EQ::constants::stanceAggressive;
 
-	_baseBotStance = EQ::constants::stancePassive;
 	_botStance = defaultStance;
 }
 

zone/bot.h

@@ -787,7 +787,6 @@ private:
 	uint32 _lastZoneId;
 	bool _rangerAutoWeaponSelect;
 	EQ::constants::StanceType _botStance;
-	EQ::constants::StanceType _baseBotStance;
 	unsigned int RestRegenHP;
 	unsigned int RestRegenMana;
 	unsigned int RestRegenEndurance;