Non-participant players still receive wins in KotF

[Owehttamy]

If a player joins a winning team on KotF and said team doesn't drop the flag before time runs out, the player who joined (but did not play) earns a win as well. This would seem to be an unlikely occurrence but it just happened to me, so it's more common than expected.

To Reproduce

1. Get a KotF map
2. Have one team hold onto the flag until close to the end of the match
3. Join the winning team
4. Wait

Expected behavior
The player who didn't have any chance of participating does not deserve a win in their stats, they did not play and rather spectated the whole time.