Remove evaluation grain
Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/66fa345a86d5ee47d953b86e
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 39776 W: 10528 L: 10306 D: 18942
Ptnml(0-2): 134, 4674, 10063, 4870, 147
Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/66facfb886d5ee47d953b8a8
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 64230 W: 16484 L: 16305 D: 31441
Ptnml(0-2): 38, 7195, 17483, 7348, 51
closes https://github.com/official-stockfish/Stockfish/pull/5613
bench 1013135