PFW-964: Skip filament unload/load after Shipping factory reset

[3d-gussner]

when MMU is enabled. With MMU enabled no filament should be loaded while idle.

[github-actions]

All values in bytes. Δ Delta to base

Target	ΔFlash	ΔSRAM	Used Flash	Used SRAM	Free Flash	Free SRAM
MK3S_MULTILANG	10	0	247784	5653	6168	2539
MK3_MULTILANG	10	0	247082	5662	6870	2530

[leptun]

I don't see any issues with this. Just as a check that I understood the code, this is the unload between xyz cal and thermal model cal?

[3d-gussner]

I don't see any issues with this. Just as a check that I understood the code, this is the unload between xyz cal and thermal model cal?

It just skips the unload/load when MMU is enabled, which is normally a case after someone enabled the MMU and then Shipping reset the printer.
@leptun Thanks for the review and approval.