simulator_sih: reduce drag

According to Claude, the aerodynamic drag was way too high, and higher
than e.g. Gazebo Classic.

Another hint that it was too high is that the model
1102_tailsitter_duo_sih.hil had it at 0.2 as well.

Reducing this, makes acceleration of the quadx more realistic and it
starts passing CI tests where speed is checked. Without it, it tends to
be too slow.

src/modules/simulation/simulator_sih/sih_params.c

@@ -212,7 +212,7 @@ PARAM_DEFINE_FLOAT(SIH_L_PITCH, 0.2f);
  * @increment 0.05
  * @group Simulation In Hardware
  */
-PARAM_DEFINE_FLOAT(SIH_KDV, 1.0f);
+PARAM_DEFINE_FLOAT(SIH_KDV, 0.15f);
 
 /**
  * First order angular damper coefficient