Normalize "pawn in front of minor" patch

No functional change.
Further tweak movecount pruning

Passed both short TC
LLR: 2.95 (-2.94,2.94)
Total: 15140 W: 3125 L: 2976 D: 9039

And long TC
LLR: 2.95 (-2.94,2.94)
Total: 17118 W: 3165 L: 2974 D: 10979

bench: 4132374
Remove useless condition in KXK endgame

Because eval is never called when in check.

No functional change.
Fix crash when reaching max ply

Bug introduced in 1b7223a53c419212efbd that
updated the ss base stack without increasing
the dimension.

No functional change.