ArenaTeamUninviteByName

Removes a member from an arena team.

Signature:

Arguments:

• team - Index of one of the player's arena teams (number, arenaTeamID)
  
• name - Name of a team member to remove (string)

This function does not prompt the user for confirmation before its results take effect -- that behavior is provided by the default UI, and this function is called from the confirmation dialog