Scene Unit Scale is not propagated with the settings during Max startup

[moonyuet]

Note: Right now the OP Settings not being propagated on initial host launch which would be also preffered, but this PR do what it should in general.

Originally posted by @LiborBatek in https://github.com/ynput/OpenPype/pull/6097#pullrequestreview-1801947289

[cuID:OP-7974]