Plane: removed an unnecessary delay on init

ArduPlane/system.cpp

@@ -394,7 +394,6 @@ void Plane::startup_INS_ground(void)
 
     if (ins.gyro_calibration_timing() != AP_InertialSensor::GYRO_CAL_NEVER) {
         gcs().send_text(MAV_SEVERITY_ALERT, "Beginning INS calibration. Do not move plane");
-        hal.scheduler->delay(100);
     } else {
         gcs().send_text(MAV_SEVERITY_ALERT, "Skipping INS calibration");
     }