Fixed system to use the BattleEngine result.

systems.cpp

@@ -231,7 +231,7 @@ void System::combat(GameLevel &level, int attack_id) {
   }
 
   while(auto act = battle.next()) {
-    auto [enemy, action] = *act;
+    auto [enemy, enemy_action] = *act;
 
     Events::Combat result {
       player_combat.attack(enemy.combat), 0
@@ -242,7 +242,7 @@ void System::combat(GameLevel &level, int attack_id) {
       world.set<SpriteEffect>(enemy.entity, {100, effect});
     }
 
-    if(enemy.ai.wants_to("kill_enemy")) {
+    if(enemy_action == combat::BattleAction::ATTACK) {
       result.enemy_did = enemy.combat.attack(player_combat);
       animate_entity(world, enemy.entity);
     }