Simplify quiet history bonus
Passed non-regression STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 230240 W: 58691 L: 58684 D: 112865
Ptnml(0-2): 402, 26840, 60621, 26863, 394
https://tests.stockfishchess.org/tests/view/6a95b22608c0f6a39c9e8fbe
Passed non-regression LTC (rebased)
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 272106 W: 70243 L: 70278 D: 131585
Ptnml(0-2): 81, 29104, 77725, 29055, 88
https://tests.stockfishchess.org/tests/view/6a9832e308c0f6a39c9e950f
closes https://github.com/official-stockfish/Stockfish/pull/7138
Bench: 2031952