Prefetch tt cluster for the new zobrist key after makemove

[TheRealGioviok]

Simple prefetching, can be done better and in more places.

Passed STC

Test  | ttprefetch
Elo   | 6.50 +- 3.91 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.96 (-2.94, 2.94) [-3.00, 0.00]
Games | N: 8772 W: 2205 L: 2041 D: 4526
Penta | [67, 907, 2288, 1043, 81]

https://clockworkopenbench.pythonanywhere.com/test/1080/

Bench: 13067349