Fix: phantom tic-tac-toe and dark hex information state when obs type is reveal nothing #1275
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Fixes #1273 and #1274.
The info state size for pttt and dh is now smaller when the obs type is reveal-nothing. In this case, instead of storing at most 17 moves of 11 bits each, we only store at most 9 moves (no opponent moves) of 9 bits each (removed info about the player and the "unknown" move).