Revert malus and associated coefficient parameters resulting from using only quiet moves
Following #6226 and #6256, this patch ultimately corresponds to the revert of #6200.
Parameters were tuned on 60k LTC games.
STC (10+0.1 th1) was accepted:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 167488 W: 43573 L: 43063 D: 80852
Ptnml(0-2): 506, 19644, 43004, 20014, 576
https://tests.stockfishchess.org/tests/view/68f526a4637acd2a11e721c2
LTC (60+0.6 th1) was accepted:
LLR: 2.99 (-2.94,2.94) <0.50,2.50>
Total: 61068 W: 15882 L: 15510 D: 29676
Ptnml(0-2): 31, 6578, 16949, 6940, 36
https://tests.stockfishchess.org/tests/view/68fa1968637acd2a11e72a0a
Non-regression VLTC (180+1.8 th1) was accepted:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 50380 W: 13087 L: 12905 D: 24388
Ptnml(0-2): 5, 5018, 14962, 5200, 5
https://tests.stockfishchess.org/tests/view/68fdc6e5637acd2a11e72f33
closes https://github.com/official-stockfish/Stockfish/pull/6378
Bench: 2530552