Probe offset wizard fixes (#20414)

* STOW probe, reverting incorrect earlier change from #20344
* Adjust soft endstop disables, to ensure travel below bed functions properly

Co-authored-by: FanDjango <FanDjango@users.noreply.github.com>

Marlin/src/lcd/menu/menu_probe_offset.cpp

@@ -133,11 +133,13 @@ void prepare_for_probe_offset_wizard() {
 
     // Probe for Z reference
     ui.wait_for_move = true;
-    z_offset_ref = probe.probe_at_point(wizard_pos, PROBE_PT_RAISE, 0, true);
+    z_offset_ref = probe.probe_at_point(wizard_pos, PROBE_PT_STOW, 0, true);
     ui.wait_for_move = false;
 
   #endif
 
+  SET_SOFT_ENDSTOP_LOOSE(true); // Disable soft endstops for free Z movement
+
   // Move Nozzle to Probing/Homing Position
   ui.wait_for_move = true;
   current_position += probe.offset_xy;
@@ -173,7 +175,6 @@ void goto_probe_offset_wizard() {
   ui.goto_screen([]{
     _lcd_draw_homing();
     if (all_axes_homed()) {
-      SET_SOFT_ENDSTOP_LOOSE(true); // Disable soft endstops for free Z movement
       z_offset_ref = 0;             // Set Z Value for Wizard Position to 0
       ui.goto_screen(prepare_for_probe_offset_wizard);
       ui.defer_status_screen();