Fisher config: Reduce extra-distance of Z homing so that we can probe at all points.
Fisher config: Reduce extra-distance of Z homing so that we can probe at all points.

With too much extra-distance, the coordinates of the destination point for homing would require the actuator axes to be below their lowest allowed positions.
Note that virtual axis homing currently works such that it first assumes maximum position, then attempts to move down.

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