Fix Spindle/Laser compile error (#14312)

Marlin/src/lcd/menu/menu_temperature.cpp

   #endif
 
   inline void _lcd_spindle_laser_off() { set_spindle_laser_enabled(false); }
+  void set_spindle_direction(bool);
   inline void _lcd_spindle_laser_on(const bool is_M4) {
     #if SPINDLE_DIR_CHANGE
       set_spindle_direction(is_M4);
     MENU_BACK(MSG_MAIN);
     if (spindle_laser_enabled()) {
       #if ENABLED(SPINDLE_LASER_PWM)
-        MENU_ITEM_EDIT_CALLBACK(int3, MSG_LASER_POWER, &spindle_laser_power, SPEED_POWER_MIN, SPEED_POWER_MAX, update_spindle_laser_power);
+        MENU_ITEM_EDIT_CALLBACK(uint8, MSG_LASER_POWER, &spindle_laser_power, SPEED_POWER_MIN, SPEED_POWER_MAX, update_spindle_laser_power);
       #endif
       MENU_ITEM(function, MSG_LASER_OFF, _lcd_spindle_laser_off);
     }

Marlin/src/libs/numtostr.h

 char* ui8tostr4pct(const uint8_t i);
 
 // Convert uint8_t to string with 123 format
-char* ui8tostr3(const uint8_t x);
+char* ui8tostr3(const uint8_t i);
 
 // Convert int8_t to string with 123 format
 char* i8tostr3(const int8_t x);

buildroot/share/tests/megaatmega2560-tests

 opt_set TEMP_SENSOR_4 1000
 opt_set TEMP_SENSOR_BED 1
 opt_enable AUTO_BED_LEVELING_UBL RESTORE_LEVELING_AFTER_G28 DEBUG_LEVELING_FEATURE G26_MESH_EDITING ENABLE_LEVELING_FADE_HEIGHT SKEW_CORRECTION \
-           EEPROM_SETTINGS EEPROM_CHITCHAT REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER SDSUPPORT GCODE_MACROS \
+           EEPROM_SETTINGS EEPROM_CHITCHAT REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER SDSUPPORT GCODE_MACROS SPINDLE_LASER_ENABLE \
            USB_FLASH_DRIVE_SUPPORT SDCARD_SORT_ALPHA STATUS_MESSAGE_SCROLLING SCROLL_LONG_FILENAMES LIGHTWEIGHT_UI \
            CUSTOM_USER_MENUS I2C_POSITION_ENCODERS BABYSTEPPING BABYSTEP_XY LIN_ADVANCE NANODLP_Z_SYNC QUICK_HOME JUNCTION_DEVIATION MULTI_NOZZLE_DUPLICATION
 exec_test $1 $2 "Azteeg X3 with 5 extruders, RRDFGSC, probeless UBL, Linear Advance, and more"