lsm303d: init filter to 773 Hz

src/drivers/lsm303d/lsm303d.cpp

@@ -631,7 +631,7 @@ LSM303D::reset()
 	accel_set_range(LSM303D_ACCEL_DEFAULT_RANGE_G);
 	accel_set_samplerate(LSM303D_ACCEL_DEFAULT_RATE);
 	accel_set_driver_lowpass_filter((float)LSM303D_ACCEL_DEFAULT_RATE, (float)LSM303D_ACCEL_DEFAULT_DRIVER_FILTER_FREQ);
-	accel_set_onchip_lowpass_filter_bandwidth(LSM303D_ACCEL_DEFAULT_ONCHIP_FILTER_FREQ);
+	accel_set_onchip_lowpass_filter_bandwidth(0); // this gives 773Hz
 
 	mag_set_range(LSM303D_MAG_DEFAULT_RANGE_GA);
 	mag_set_samplerate(LSM303D_MAG_DEFAULT_RATE);