message: Fix regression with a disconnect check in MobManager::combatStep()
diff: @@ -488,11 +488,19 @@ void MobManager::deadStep(Mob *mob, time_t currTime) {
  void MobManager::combatStep(Mob *mob, time_t currTime) {
  assert(mob->target != nullptr);
  + // lose aggro if the player lost connection
  + if (PlayerManager::players.find(mob->target) == PlayerManager::players.end()) {
  + mob->target = nullptr;
  + mob->state = MobState::RETREAT;
  + if (!aggroCheck(mob, currTime))
  + clearDebuff(mob);
  + return;
  + }
  +
  Player *plr = PlayerManager::getPlayer(mob->target);
  - // Lose aggro if the player lost connection, became invulnerable or died
  + // lose aggro if the player became invulnerable or died
  if (plr->HP <= 0
  - || PlayerManager::players.find(mob->target) == PlayerManager::players.end()
  || (plr->iSpecialState & CN_SPECIAL_STATE_FLAG__INVULNERABLE)) {
  mob->target = nullptr;
  mob->state = MobState::RETREAT;
  