Fix TouchMI stow in G34 (#21291)

Marlin/src/gcode/calibrate/G34_M422.cpp

@@ -410,9 +410,9 @@ void GcodeSuite::G34() {
         SERIAL_ECHOLNPAIR_F("Accuracy: ", z_maxdiff);
       }
 
-      // Stow the probe, as the last call to probe.probe_at_point(...) left
-      // the probe deployed if it was successful.
-      probe.stow();
+      // Stow the probe because the last call to probe.probe_at_point(...)
+      // leaves the probe deployed when it's successful.
+      IF_DISABLED(TOUCH_MI_PROBE, probe.stow());
 
       #if ENABLED(HOME_AFTER_G34)
         // After this operation the z position needs correction