BattleAI: Fix endless loop

Fixed an issue where the part of a 2-tile-unit that is outside of the map was considered a target and caused an endless-loop in the pathfinding being unable to get there.

AI/BattleAI/AttackPossibility.cpp

@@ -245,7 +245,7 @@ AttackPossibility AttackPossibility::evaluate(
 
 	std::vector<BattleHex> defenderHex;
 	if(attackInfo.shooting)
-		defenderHex = defender->getHexes();
+		defenderHex.push_back(defender->getPosition());
 	else
 		defenderHex = CStack::meleeAttackHexes(attacker, defender, hex);