Avoid LMP when in a forced win (#1025)

Matetrack:

100,000 nodes
Main: Found 1793, Best 1027
Patch: Found 1804, Best 1042
Net (branch): Found +11, Best +15

1,000,000 nodes
Main: Found 3678, Best 2059
Patch: Found 3685, Best 2080
Net (branch): Found +7, Best +21

STC
Elo   | 2.42 +- 2.41 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.93 (-2.25, 2.89) [-2.75, 0.25]
Games | N: 18938 W: 4889 L: 4757 D: 9292
Penta | [54, 1974, 5267, 2134, 40]
https://recklesschess.space/test/14779/

LTC (unfinished)
Elo   | 0.18 +- 1.43 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=64MB
LLR   | 1.85 (-2.25, 2.89) [-2.75, 0.25]
Games | N: 45398 W: 11241 L: 11218 D: 22939
Penta | [18, 4486, 13672, 4501, 22]
https://recklesschess.space/test/14797/

Bench: 2851948

Author: Saphereye

src/search.rs

@@ -734,6 +734,7 @@ fn search<NODE: NodeType>(
             if !in_check
                 && !td.board.is_direct_check(mv)
                 && is_quiet
+                && !is_win(beta)
                 && move_count >= (2697 + 77 * improvement / 16 + 1510 * depth * depth + 70 * history / 1024) / 1024
             {
                 skip_quiets = true;