Don't use 5th continuation history in move ordering
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 136960 W: 35374 L: 35262 D: 66324
Ptnml(0-2): 420, 16214, 35049, 16428, 369
https://tests.stockfishchess.org/tests/view/67e6d0ae6682f97da2178ee5
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 233016 W: 59063 L: 59059 D: 114894
Ptnml(0-2): 113, 25430, 65421, 25428, 116
https://tests.stockfishchess.org/tests/view/67e9f7fb31d7cf8afdc44ad4
closes https://github.com/official-stockfish/Stockfish/pull/5978
Bench: 1842721