imu filter defaults: set IMU_GYRO_CUTOFF to 80 and MC_DTERM_CUTOFF to 30

tested on at least 5 different vehicles, including AeroFC. The values
should be conservative, good setups (with low vibrations) can increase
these values even further.

increasing IMU_GYRO_CUTOFF allows for better tuning gains (increased P).

src/modules/mc_att_control/mc_att_control_params.c

@@ -570,4 +570,4 @@ PARAM_DEFINE_FLOAT(MC_TPA_RATE_D, 0.0f);
  * @increment 10
  * @group Multicopter Attitude Control
  */
-PARAM_DEFINE_FLOAT(MC_DTERM_CUTOFF, 0.f);
+PARAM_DEFINE_FLOAT(MC_DTERM_CUTOFF, 30.f);