Fixed fresh, careless bug in HighsMipSolverData::trivialHeuristics() #2425

Job	Run time
debug (macos-latest)	19m 28s
debug_all_tests (macos-latest)	9m 33s
debug64 (macos-latest)	7m 54s
debug64_all_tests (macos-latest)	11m 5s
release (macos-latest)	6m 43s
release_all_tests (macos-latest)	13m 28s
Release64_all_tests (macos-latest)	12m 43s
Release64 (macos-latest)	13m 34s
	1h 34m 28s

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