Simplify PV term in lmr
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 204000 W: 52541 L: 52506 D: 98953
Ptnml(0-2): 561, 24133, 52589, 24144, 573
https://tests.stockfishchess.org/tests/view/684f24ce703522d4f129cab5
Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 156150 W: 39890 L: 39807 D: 76453
Ptnml(0-2): 82, 16882, 44043, 17007, 61
https://tests.stockfishchess.org/tests/view/6855d8bf1d0d9fc6587538f8
closes https://github.com/official-stockfish/Stockfish/pull/6148
bench 2766493