|This function is protected, and may only be called in response to hardware event.
Confirms entry into a Battleground you are queued for that is ready.
- Number - The battlefield in queue to enter.
- Boolean - Whether or not to accept entry to the battlefield.
Passing 0 or nil as an accept argument will cause you to leave the queue for the battlefield, if you are inside a battlefield you will leave it regardless if it's ended or not.