fix: illegal moves when engine times out

[Disservin]

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Results of engine1 vs engine2 (2+0.02, 1t, 16MB, book.epd):
Elo: -78.52 +/- 162.75, nElo: -86.86 +/- 160.50
LOS: 14.44 %, DrawRatio: 55.56 %, PairsRatio: 0.33
Games: 18, Wins: 7, Losses: 11, Draws: 0, Points: 7.0 (38.89 %)
Ptnml(0-2): [3, 0, 5, 0, 1]
LLR: -0.06 (-2.94, 2.94) [0.00, 5.00]
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Warning; No bestmove found in the last line from engine1
Warning; No bestmove found in the last line from engine1
Warning; No info line found in the last line which includes the score from engine1
Warning; No info line found in the last line which includes the score from engine1
Warning; No info line found in the last line which includes the score from engine1
Warning; No info string found in the last line from engine1 which includes the score
Warning; Engine engine1 loses on time
Finished game 10 (engine1 vs engine2): 0-1 {engine1 loses on time}
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Results of engine1 vs engine2 (2+0.02, 1t, 16MB, book.epd):
Elo: -70.44 +/- 143.13, nElo: -81.89 +/- 152.27
LOS: 14.59 %, DrawRatio: 60.00 %, PairsRatio: 0.33
Games: 20, Wins: 8, Losses: 12, Draws: 0, Points: 8.0 (40.00 %)
Ptnml(0-2): [3, 0, 6, 0, 1]
LLR: -0.06 (-2.94, 2.94) [0.00, 5.00]
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Finished match.
Saved results.

fixes #486