Fix SpindleLaser class

Fix #14465

Marlin/src/feature/spindle_laser.h

 
   //static bool active() { return READ(SPINDLE_LASER_ENA_PIN) == SPINDLE_LASER_ACTIVE_HIGH; }
 
+  static void update_output();
+
   #if ENABLED(SPINDLE_LASER_PWM)
-    static void update_output();
     static void set_ocr(const uint8_t ocr);
     static inline void set_ocr_power(const uint8_t pwr) { power = pwr; set_ocr(pwr); }
-  #else
-    static inline void update_output() { }
   #endif
 
   // Wait for spindle to spin up or spin down