stepper: Query the stepper mcu position during startup

Try to keep the host mcu_position synchronized with the
micro-controller by querying during startup and after every homing
event.

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

klippy/mcu.py

@@ -122,7 +122,7 @@ class MCU_trsync:
         params = self._trsync_query_cmd.send([self._oid,
                                               self.REASON_HOST_REQUEST])
         for s in self._steppers:
-            s.note_homing_end(did_trigger=True) # XXX
+            s.note_homing_end()
         return params['trigger_reason']
 
 class MCU_endstop: