Add mavic air 2 readout time

opendm/rollingshutter.py

@@ -12,6 +12,7 @@ RS_DATABASE = {
     'dji fc6310': 33, # Phantom 4 Professional
 
     'dji fc7203': 20, # Mavic Mini v1
+    'dji fc3170': 27, # DJI Mavic Air 2
 
     'dji fc350': 30, # Inspire 1
 
@@ -42,4 +43,4 @@ def get_rolling_shutter_readout(make, model, override_value=0):
         if not key in warn_db_missing:
             log.ODM_WARNING("Rolling shutter readout time for \"%s %s\" is not in our database, using default of %sms which might be incorrect. Use --rolling-shutter-readout to set an actual value (see https://github.com/OpenDroneMap/RSCalibration for instructions on how to calculate this value)" % (make, model, DEFAULT_RS_READOUT))
             warn_db_missing[key] = True
-        return float(DEFAULT_RS_READOUT)
+        return float(DEFAULT_RS_READOUT)