🔍 LMP: increase margin with quiet history

[eduherminio]

Test  | search/lmp-quiethistory
Elo   | 0.46 +- 1.87 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -0.77 (-2.25, 2.89) [0.00, 3.00]
Games | 44032: +11018 -10960 =22054
Penta | [496, 5344, 10257, 5444, 475]
https://openbench.lynx-chess.com/test/2927/