🩹 Fix Input Shaping "enable" for SHAPING_FREQ_[XY] == 0 (MarlinFirmware#26075)

Author: tombrazier

Marlin/src/lcd/menu/menu_advanced.cpp

@@ -691,7 +691,7 @@ void menu_bedlevel_points();
           EDIT_ITEM_FAST_N(float42_52, X_AXIS, MSG_SHAPING_ZETA, &editable.decimal, 0.0f, 1.0f, []{ stepper.set_shaping_damping_ratio(X_AXIS, editable.decimal); });
         }
         else
-          ACTION_ITEM_N(X_AXIS, MSG_SHAPING_ENABLE, []{ stepper.set_shaping_frequency(X_AXIS, SHAPING_FREQ_X); ui.refresh(); });
+          ACTION_ITEM_N(X_AXIS, MSG_SHAPING_ENABLE, []{ stepper.set_shaping_frequency(X_AXIS, (SHAPING_FREQ_X) ?: (SHAPING_MIN_FREQ)); ui.refresh(); });
       #endif
       #if ENABLED(INPUT_SHAPING_Y)
         editable.decimal = stepper.get_shaping_frequency(Y_AXIS);
@@ -703,7 +703,7 @@ void menu_bedlevel_points();
           EDIT_ITEM_FAST_N(float42_52, Y_AXIS, MSG_SHAPING_ZETA, &editable.decimal, 0.0f, 1.0f, []{ stepper.set_shaping_damping_ratio(Y_AXIS, editable.decimal); });
         }
         else
-          ACTION_ITEM_N(Y_AXIS, MSG_SHAPING_ENABLE, []{ stepper.set_shaping_frequency(Y_AXIS, SHAPING_FREQ_Y); ui.refresh(); });
+          ACTION_ITEM_N(Y_AXIS, MSG_SHAPING_ENABLE, []{ stepper.set_shaping_frequency(Y_AXIS, (SHAPING_FREQ_Y) ?: (SHAPING_MIN_FREQ)); ui.refresh(); });
       #endif
 
       END_MENU();