kinematics: Fix "Unable to infer active extruder stepper" errors.

[xtoddx]

Background

x-in-1-out hotend configurations currently require naming the tool in the slicer and adding an extra extruder=... paramter to SET_PRESSURE_ADVANCE g-code. Failure to add the parameter results in Unable to infer active extruder stepper errors and aborted prints on the first tool change (at least with PrusaSlicer-like software).

As the error message states, there is an attempt to infer the value, but currently the value of printer.toolhead.extruder.extruder_stepper is always the primary extruder_stepper (the one named "extruder").

This updates the sync_to_extruder method so the printer model is kept consistent with the currently active extruder_stepper by assigning it to the PrinterExtruder.

[JamesH1978]

Thank you for submitting a PR, please could you refer to point 3 in the "what to expect" section in https://github.com/Klipper3d/klipper/blob/master/docs/CONTRIBUTING.md and add a signed-off-by line.

Thanks James

[xtoddx]

Updated. Apologies for the oversight.

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[KevinOConnor]

Thanks. However, this PR doesn't look like it would work correctly when multiple steppers are simultaneously assigned to the same extruder. It doesn't look correct to change the main extruder's reference to its specific stepper.

-Kevin

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