esp32: drop unused channel argument

Author: zachwelch

src/esp32/Servo.cpp

@@ -54,11 +54,11 @@ class ServoImpl {
 #endif
     }
 
-    void set(const uint8_t _channel, const uint32_t duration_us) {
+    void set(const uint32_t duration_us) {
       ledcWrite(ref(), LEDC_US_TO_TICKS(duration_us));
     }
 
-    uint32_t get(const uint8_t _channel) const {
+    uint32_t get() const {
       return LEDC_TICKS_TO_US(ledcRead(ref()));
     }
 
@@ -137,7 +137,7 @@ void Servo::writeMicroseconds(int value)
     else if (value > SERVO_MAX())
       value = SERVO_MAX();
 
-    servos[this->servoIndex]->set(this->servoIndex, value);
+    servos[this->servoIndex]->set(value);
   }
 }
 
@@ -151,7 +151,7 @@ int Servo::readMicroseconds()
   if (!servos[this->servoIndex]) {
     return 0;
   }
-  return servos[this->servoIndex]->get(this->servoIndex);
+  return servos[this->servoIndex]->get();
 }
 
 bool Servo::attached()