Update forgotten MSG_ c=

Firmware/ultralcd.cpp

@@ -5543,7 +5543,7 @@ static void lcd_main_menu()
                 MENU_ITEM_SUBMENU_P(_T(MSG_CARD_MENU), lcd_sdcard_menu);
             }
 #if SDCARDDETECT < 1
-        MENU_ITEM_GCODE_P(_i("Change SD card"), PSTR("M21"));  // SD-card changed by user////MSG_CNG_SDCARD
+        MENU_ITEM_GCODE_P(_i("Change SD card"), PSTR("M21"));  // SD-card changed by user////MSG_CNG_SDCARD c=18
 #endif //SDCARDDETECT
         }
     } else {