TEMPORARY FIX (NOTE: Doesn't work when you take flight master)
In fight class, under spells add
RunMacroText("/click PVPReadyDialogEnterBattleButton") and put to the top.
Under Spell Conditions add "In Battleground", value false.
Spell settings
Can move during cast: Yes
Cast if mounted: True
Check if know spell: False
Check if spell good distance: False
Check if spell is usable: False
Check if target is in view: False
Combat only: False
Not spell, is lua script: True