change the bonusScale depth component
Passed STC:
https://tests.stockfishchess.org/tests/view/67d35f66517865b4a2dfc801
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 110816 W: 28875 L: 28449 D: 53492
Ptnml(0-2): 329, 13064, 28231, 13420, 364
Passed LTC:
https://tests.stockfishchess.org/tests/view/67d4bdf0517865b4a2dfd131
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 121824 W: 31047 L: 30559 D: 60218
Ptnml(0-2): 52, 13056, 34214, 13532, 58
closes https://github.com/official-stockfish/Stockfish/pull/5932
Bench: 2128807