ArduCopter: allow logging of both IMU and IMU_RAW

allow logging of both IMU and IMU_RAW at the same time so that filtering and errors can be seen

ArduCopter/Copter.cpp

@@ -389,8 +389,7 @@ void Copter::twentyfive_hz_logging()
         Log_Write_EKF_POS();
     }
 
-    // log IMU data if we're not already logging at the higher rate
-    if (should_log(MASK_LOG_IMU) && !should_log(MASK_LOG_IMU_RAW)) {
+    if (should_log(MASK_LOG_IMU)) {
         logger.Write_IMU();
     }
 #endif