Adjust NNUE usage based on number of pawns in position. #2960
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passed STC
https://tests.stockfishchess.org/tests/view/5f2f02d09081672066536b1f
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 36520 W: 5011 L: 4823 D: 26686
Ptnml(0-2): 299, 3482, 10548, 3594, 337
passed LTC
https://tests.stockfishchess.org/tests/view/5f2f4c329081672066536b5c
LLR: 2.98 (-2.94,2.94) {0.25,1.75}
Total: 39272 W: 2630 L: 2433 D: 34209
Ptnml(0-2): 53, 2066, 15218, 2229, 70
Idea of this patch is that positions are usually more complex and hard to evaluate even if one side has more material if they have more pawns.
This patch adjusts NNUE threshold usage depending on number of pawns in position, if pawn count is <3 we use "classical" evaluation more often, for pawn count = 3 patch is non-functional, with pawn count > 3 NNUE evaluation is used more often.
bench 4084753