⌛ Don't search for shorted mates or adjust soft time bound when low on time

[eduherminio]

Test  | tm/limit-shorter-mate-finding
Elo   | 1.39 +- 4.17 (95%)
SPRT  | 10.0+0.00s Threads=1 Hash=32MB
LLR   | 0.17 (-2.25, 2.89) [0.00, 3.00]
Games | 11776: +3245 -3198 =5333
Penta | [287, 1419, 2442, 1440, 300]
https://openbench.lynx-chess.com/test/1250/

40+0.4

Score of Lynx-tm-limit-shorter-mate-finding-5261-win-x64 vs Lynx 5259 - main: 7490 - 7407 - 16253  [0.501] 31150
...      Lynx-tm-limit-shorter-mate-finding-5261-win-x64 playing White: 6416 - 1052 - 8107  [0.672] 15575
...      Lynx-tm-limit-shorter-mate-finding-5261-win-x64 playing Black: 1074 - 6355 - 8146  [0.330] 15575
...      White vs Black: 12771 - 2126 - 16253  [0.671] 31150
Elo difference: 0.9 +/- 2.7, LOS: 75.2 %, DrawRatio: 52.2 %
SPRT: llr -0.93 (-32.2%), lbound -2.25, ubound 2.89

w/ Don't do soft bound scaling when short on time

Test  | tm/limit-shorter-mate-finding
Elo   | -19.93 +- 8.53 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.26 (-2.25, 2.89) [0.00, 3.00]
Games | 2984: +749 -920 =1315
Penta | [104, 413, 587, 326, 62]
https://openbench.lynx-chess.com/test/1254/