Tune trapped rook

Passed STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 15687 W: 3352 L: 3199 D: 9136

and LTC (tested in 'parameters tweak' mode)
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 27983 W: 5046 L: 4797 D: 18140

bench: 7634225
Remove useless condition in time management

There is no reson to artificially limit the
pv_instability rule below a max depth.

Spotted by Uri Blass

bench: 7634225