MPC_MAN_Y_MAX: changed default from 200 to 150 deg/s

- we have set the maximum yaw-rate MC_YAWRATE_MAX to 200 degrees and it
makes senses to leave a bit of margin between what the user can demand
and what the limits of the vehicle are

Signed-off-by: RomanBapst <bapstroman@gmail.com>

src/modules/mc_pos_control/mc_pos_control_params.c

@@ -393,7 +393,7 @@ PARAM_DEFINE_FLOAT(MPC_MAN_TILT_MAX, 35.0f);
  * @decimal 1
  * @group Multicopter Position Control
  */
-PARAM_DEFINE_FLOAT(MPC_MAN_Y_MAX, 200.0f);
+PARAM_DEFINE_FLOAT(MPC_MAN_Y_MAX, 150.0f);
 
 /**
  * Deadzone of sticks where position hold is enabled