⌛ Increase hard bound

[eduherminio]

Before #664 the concepts of hard and soft bounds for time management existed in Lynx, buuuut hard bound was being calculated taking account time/movesToGo, resulting in a bound that was often being hit rather than a safety precaution, which is what most engines do.

This PR changes that, setting hard bound to 25% of the total available time, which is 7.5 times what I had before

8+0.08
Score of Lynx-time-management-soft-hard-bounds-2-adjust-2639-win-x64 vs Lynx 2634 - main: 358 - 222 - 307  [0.577] 887
...      Lynx-time-management-soft-hard-bounds-2-adjust-2639-win-x64 playing White: 233 - 61 - 150  [0.694] 444
...      Lynx-time-management-soft-hard-bounds-2-adjust-2639-win-x64 playing Black: 125 - 161 - 157  [0.459] 443
...      White vs Black: 394 - 186 - 307  [0.617] 887
Elo difference: 53.7 +/- 18.6, LOS: 100.0 %, DrawRatio: 34.6 %
SPRT: llr 2.9 (100.2%), lbound -2.25, ubound 2.89 - H1 was accepted

40+0.4
Score of Lynx-time-management-soft-hard-bounds-2-adjust-2639-win-x64 vs Lynx 2634 - main: 438 - 313 - 546  [0.548] 1297
...      Lynx-time-management-soft-hard-bounds-2-adjust-2639-win-x64 playing White: 318 - 85 - 245  [0.680] 648
...      Lynx-time-management-soft-hard-bounds-2-adjust-2639-win-x64 playing Black: 120 - 228 - 301  [0.417] 649
...      White vs Black: 546 - 205 - 546  [0.631] 1297
Elo difference: 33.6 +/- 14.4, LOS: 100.0 %, DrawRatio: 42.1 %
SPRT: llr 2.9 (100.3%), lbound -2.25, ubound 2.89 - H1 was accepted