small simp of fauzi's recent futility commit

[Ergodice]

Simplify condition in futility pruning

Passed STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 427040 W: 111061 L: 111271 D: 204708
Ptnml(0-2): 1709, 48524, 113171, 48500, 1616
https://tests.stockfishchess.org/tests/view/67af01d01a4c73ae1f930ea4

Passed rebased LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 28704 W: 7330 L: 7120 D: 14254
Ptnml(0-2): 8, 3000, 8138, 3186, 20
https://tests.stockfishchess.org/tests/view/67ca629a45214989aa0a123e

bench 1823605

[github-actions]

clang-format 18 needs to be run on this PR.
If you do not have clang-format installed, the maintainer will run it when merging.
For the exact version please see https://packages.ubuntu.com/noble/clang-format-18.

(execution 13742375216 / attempt 1)

[FauziAkram]

Just a quick note that might be useful for other devs/maintainers.

Since the LTC test bench remained unchanged (unlike the STC test), I ran a debug to investigate why.

master...FauziAkram:Stockfish:ewf4343f34

However, as shown below:
Hit #0: Total 266108 Hits 256813 Hit Rate (%) 96.5071
Mean #0: Total 266108 Mean -0.605431
Extremity #0: Total 266108 Min -10 Max 32

The hit rate of the removed condition isn’t 100%, and lmrdepth exceeds 7, which makes it extra strange that bench is unvaried.