fix SCS0009 attach miss

Author: mongonta0716

src/Stackchan_servo.cpp

@@ -39,6 +39,7 @@ void StackchanSERVO::attachServos() {
   if (_servo_type == ServoType::SCS) {
     // SCS0009
     Serial2.begin(1000000, SERIAL_8N1, _init_param.servo[AXIS_X].pin, _init_param.servo[AXIS_Y].pin);
+    delay(500);
     _sc.pSerial = &Serial2;
     _sc.WritePos(AXIS_X + 1, convertSCS0009Pos(_init_param.servo[AXIS_X].start_degree + _init_param.servo[AXIS_X].offset), 1000);
     _sc.WritePos(AXIS_Y + 1, convertSCS0009Pos(_init_param.servo[AXIS_Y].start_degree + _init_param.servo[AXIS_Y].offset), 1000);