Adjust lower bound for CAL_AIR_TUBED_MM to 1.5 mm

Below 1.5 mm the tube pressure drow compensation will result in unrealistic compensation factors causing the measured airspeed to be too high.
In addition sensirion recommends a diameter of 1.8 mm or larger for the tubes.

src/modules/sensors/sensor_params.c

@@ -68,7 +68,7 @@ PARAM_DEFINE_FLOAT(CAL_AIR_TUBELEN, 0.2f);
 /**
  * Airspeed sensor tube diameter. Only used for the Tube Pressure Drop Compensation.
  *
- * @min 0.1
+ * @min 1.5
  * @max 100
  * @unit mm
  *