Apply loop shorthand macros (#17159)

Marlin/src/HAL/shared/servo.cpp

@@ -68,7 +68,7 @@ uint8_t ServoCount = 0;                         // the total number of attached
 
 static boolean isTimerActive(timer16_Sequence_t timer) {
   // returns true if any servo is active on this timer
-  for (uint8_t channel = 0; channel < SERVOS_PER_TIMER; channel++) {
+  LOOP_L_N(channel, SERVOS_PER_TIMER) {
     if (SERVO(timer, channel).Pin.isActive)
       return true;
   }