🦈 IMP: Increase QSearch Max Depth

[TheBlackPlague]

🎯 Summary

This PR increases the max depth of QSearch, and makes it dependent on the Search upper limit. This is a small correctness change.

👏 Acknowledgements

NA

📈 ELO

STC:

ELO   | -0.25 +- 1.48 (95%)
SPRT  | 10.0+0.10s Threads=1 Hash=16MB
LLR   | 2.97 (-2.94, 2.94) [-3.00, 1.00]
GAMES | N: 114624 W: 31102 L: 31186 D: 52336

LTC:

ELO   | 1.71 +- 3.13 (95%)
SPRT  | 60.0+0.60s Threads=1 Hash=256MB
LLR   | 2.95 (-2.94, 2.94) [-3.00, 1.00]
GAMES | N: 24160 W: 6233 L: 6114 D: 11813