Fix 960 initialization problem

[QueensGambit]

This PR adds is960 to init_policy_constants() and StateConstants::init().
Also updates tests.cpp.

No Elo change.

TC: 30ms per move
./cutechess-cli -variant standard -openings file=UHO_V3_8mvs_big_+140_+169.epd format=epd order=random -pgnout 960_support_30ms_per_move.pgn -resign movecount=5 score=600 -draw movenumber=30 movecount=4 score=20 -concurrency 1 -engine name=ClassicAra-960-support cmd=./ClassicAra_960_support dir=/data/SL proto=uci -engine name=ClassicAra cmd=./ClassicAra dir=/data/SL proto=uci -each option.Batch_Size=16 option.First_Device_ID=7 
tc=0/60+0.1 option.Fixed_Movetime=30 -games 2 -rounds 500 -repeat

Score of ClassicAra-960-support vs ClassicAra: 436 - 403 - 161  [0.516] 1000
Elo difference: 11.5 +/- 19.7, LOS: 87.3 %, DrawRatio: 16.1 %
Finished match