Fail medium in stand pat

[Yoshie2000]

STC

Elo   | 2.09 +- 1.62 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.96 (-2.25, 2.89) [0.00, 3.00]
Games | N: 45534 W: 11120 L: 10846 D: 23568
Penta | [115, 5262, 11758, 5498, 134]
https://chess.aronpetkovski.com/test/8263/

LTC

Elo   | 1.10 +- 1.07 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=64MB
LLR   | 1.82 (-2.25, 2.89) [0.00, 3.00]
Games | N: 93286 W: 22798 L: 22503 D: 47985
Penta | [47, 10418, 25434, 10681, 63]
https://chess.aronpetkovski.com/test/8266/

Bench: 2459953