Server can remove normal table on healthy check

Not critical bug.

Found rare bug with non started games (server logs shows `has no deck` error) -- on last 4 days it raises only 3 time on de-server.

```
WARN 2020-01-09 21:10:21,603 Removing unhealthy tableId d34318b2-e9e6-47e5-836d-dfd07029c4e1 =>[pool-10-thread-1] TableManager.lambda$checkTableHealthState$2
ERROR 2020-01-09 21:10:21,626 Match: 614df0ad-dcdf-4fd2-87a7-3876f9c3d5d2 RobbyJ has no deck. =>[GAME 08fd92d8-9d01-4d6a-82c5-e373d528396d] MatchImpl.initGame
ERROR 2020-01-09 21:10:21,633 Match: 614df0ad-dcdf-4fd2-87a7-3876f9c3d5d2 SpeedNeo7 has no deck. =>[GAME 08fd92d8-9d01-4d6a-82c5-e373d528396d] MatchImpl.initGame
```

Found only one place that can cause that -- it's table remove in `checkTableHealthState` -> `isMatchTableStillValid`. If the healthy check call (once per 10 minutes) gets between two games with sideboarding then bug possible (user reported that there were no sideboard window -- new game started immediately):

> Xmage skips sideboarding and goes directly to the next game after someone concedes. Then it gets stuck into that screen