Fix set_home_offset bug from bad porting

Marlin/src/module/motion.cpp

@@ -1376,15 +1376,10 @@ void homeaxis(const AxisEnum axis) {
 
 #if HAS_M206_COMMAND
   /**
-   * Change the home offset for an axis, update the current
+   * Change the home offset for an axis.
-   * position and the software endstops to retain the same
+   * Also refreshes the workspace offset.
-   * relative distance to the new home.
-   *
-   * Since this changes the current_position, code should
-   * call sync_plan_position soon after this.
    */
   void set_home_offset(const AxisEnum axis, const float v) {
-    current_position[axis] += v - home_offset[axis];
     home_offset[axis] = v;
     update_software_endstops(axis);
   }