sensor_combined: replace accel & gyro integral with value, use float for dt

Reason: the value is easier to read & handle (for example plotting). In
most places the value is needed, not the integral.

Note that this breaks the replay format for sdlog2 replay

src/modules/commander/calibration_routines.cpp

@@ -273,7 +273,7 @@ enum detect_orientation_return detect_orientation(orb_advert_t *mavlink_log_pub,
 
 			for (unsigned i = 0; i < ndim; i++) {
 
-				float di = sensor.accelerometer_integral_m_s[i] / (sensor.accelerometer_integral_dt / 1.e6f);
+				float di = sensor.accelerometer_m_s2[i];
 
 				float d = di - accel_ema[i];
 				accel_ema[i] += d * w;