stepper_enable: Directly call clear_homing_state() on motor off event

Call clear_homing_state() on each motor off event.  This simplifies
the kinematic classes as they no longer need to register and handle
the motor_off event.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/stepper_enable.py

@@ -94,6 +94,7 @@ class PrinterStepperEnable:
         print_time = toolhead.get_last_move_time()
         for el in self.enable_lines.values():
             el.motor_disable(print_time)
+        toolhead.get_kinematics().clear_homing_state((0, 1, 2))
         self.printer.send_event("stepper_enable:motor_off", print_time)
         toolhead.dwell(DISABLE_STALL_TIME)
     def motor_debug_enable(self, stepper, enable):