Fix stepper motor low side current sensing#472

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AntonEvmenenko wants to merge 2 commits intosimplefoc:devfrom

AntonEvmenenko:stepper_motor_low_side_current_sensing

Commits on May 20, 2025

Current sign restored using the commanded voltage
AntonEvmenenko
committed

Commits on May 21, 2025

Limit changes to stepper motors only
AntonEvmenenko
committed