Player::canBuildMoreOfType can allow production beyond MaxSimultaneousOfType #3465

Reported by bots in #3463

Player::canBuildMoreOfType can allow production beyond MaxSimultaneousOfType when a linked variant is already queued: existing objects are counted by MaxSimultaneousLinkKey, but countUnitTypeInQueue counts only the exact type. Include queued templates sharing the link key in the queue count.