Autobalance lobby button should balance based on displayed rating

### Describe the Feature

When using autobalance the players are allegedly (I didn't test this, but Seraphim-Noob reported it) sorted by their mean.
This is a problem because new players have a mean of 1500 and are obviously unable to perform on this level. Instead the autobalancer should use the displayed rating as this is a better assessment of their skill. At the moment this problem means that new players get kicked often because the host can't rely on the autobalance functionality and doesn't want to balance manually.