Fix CoreXY speed calculation
For cartesian bots, the X_AXIS is the real X movement and same for Y_AXIS. But for corexy bots, that is not true. The "X_AXIS" and "Y_AXIS" motors (that should be named to A_AXIS and B_AXIS) cannot be used for X and Y length, because A=X+Y and B=X-Y. So we need to create other 2 "AXIS", named X_HEAD and Y_HEAD, meaning the real displacement of the Head. Having the real displacement of the head, we can calculate the total movement length and apply the desired speed.
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