Small speedup for movecount pruning #4823
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In search, when moveCountPruning becomes true, it can never turn false again.
Passed STC https://tests.stockfishchess.org/tests/view/652075ceac57711436728aac
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 136448 W: 34923 L: 34472 D: 67053
Ptnml(0-2): 420, 15094, 36767, 15501, 442
Non functional change