mace fitting breaks because ASE fails to write an extxyz from a non-subscriptable iterable

[bernstei]

As per https://gitlab.com/ase/ase/-/issues/1730, ASE fails to write an extxyz from a non-subscriptable iterable, at least under some circumstances. It fails in this line

workflow/wfl/fit/mace.py

Line 240 in 1f06bfe

ase.io.write(filename, configs)

in tests of another (not yet public) project, while it didn't before. Perhaps for some reason move_mask is now being created?

In any case, need to decide if we should convert the configset into a list before writing, or what, assuming it'll take at least some time for ASE to be fixed.