Don't get chosen as the tagger if you're a spectator

changed milestone to %2.2.3

merged

mentioned in commit ebafd4b2

This bugfix appears to have exposed a separate bug, in which players will not become IT when entering the game in custom tag gamemodes, even if there are no IT players on the field. However if the player enters the game, turns into a spectator, then re-enters the game, they will become IT as appropriate. Standard Tag behaves normally.