Travel time is not written to matrices for vans, trucks and trailer trucks

[zptro]

This needs to be done for vans, trucks and trailer trucks as well in last iteration, otherwise travel time matrices for these modes will consist of nothing.

helmet-model-system/Scripts/assignment/assignment_period.py

Lines 146 to 148 in 5ee259e

	for ass_class in ("car_work", "car_leisure"):
	mtxs["time"][ass_class] = self._extract_timecost_from_gcost(
	ass_class)

Thanks for noticing, @johpiip!