Fix history heuristic bug

[0qln]

Score of ccbench/in/builds/nephrid-739dfa5 vs ccbench/in/builds/nephrid-579e3cd: 691 - 478 - 1719  [0.537] 2888
...      ccbench/in/builds/nephrid-739dfa5 playing White: 338 - 245 - 861  [0.532] 1444
...      ccbench/in/builds/nephrid-739dfa5 playing Black: 353 - 233 - 858  [0.542] 1444
...      White vs Black: 571 - 598 - 1719  [0.495] 2888
Elo difference: 25.7 +/- 8.0, LOS: 100.0 %, DrawRatio: 59.5 %
SPRT: llr 2.95 (100.1%), lbound -2.94, ubound 2.94 - H1 was accepted

Player: ccbench/in/builds/nephrid-739dfa5
   "Draw by 3-fold repetition": 1622
   "Draw by fifty moves rule": 12
   "Draw by insufficient mating material": 81
   "Draw by stalemate": 4
   "Loss: Black mates": 245
   "Loss: White mates": 233
   "No result": 23
   "Win: Black mates": 353
   "Win: White mates": 338
Player: ccbench/in/builds/nephrid-579e3cd
   "Draw by 3-fold repetition": 1622
   "Draw by fifty moves rule": 12
   "Draw by insufficient mating material": 81
   "Draw by stalemate": 4
   "Loss: Black mates": 353
   "Loss: White mates": 338
   "No result": 23
   "Win: Black mates": 245
   "Win: White mates": 233
Finished match