Feature: Improved logic when a player leaves the arena match early

[Daxt3r]

Describe your feature request or suggestion in detail

The rating loss for leaving an arena match early should be adjusted to take other aspects into account:

1. One or both team members have already died.
2. The player themselves has already died and wants to leave the match.

In my opinion, both of these would be valid reasons for leaving the match early without being penalised to the maximum extent. In these cases, the normal rating loss should apply rather than the penalty.

Describe a possible solution to your feature or suggestion in detail

The method void Solo3v3::CountAsLoss(Player* player, bool isInProgress) in the class solo3v3.cpp would need to be extended to include the corresponding checks.