Make sure stats updates are never bigger than maximum value of stats. #5116
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In current master you always need to keep track if you may update stats with values too big for them.
This patch makes sure that even if you pass such update it would be lowered to value low enough, so is a QoL change.
Passed non-regression bounds :
https://tests.stockfishchess.org/tests/view/65ef2af40ec64f0526c44cbc
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 179232 W: 46513 L: 46450 D: 86269
Ptnml(0-2): 716, 20323, 47452, 20432, 693
non-functional change