autotest: disable wind drag

this is causing some crazy results in stabilize mode. Disable it until
we sort it out

Tools/autotest/pysim/multicopter.py

@@ -143,7 +143,9 @@ class MultiCopter(Aircraft):
         accel_earth += air_resistance
 
         # add in some wind (turn force into accel by dividing by mass).
-        accel_earth += self.wind.drag(self.velocity) / self.mass
+        # NOTE: disable this drag correction until we work out
+        # why it is blowing up
+        # accel_earth += self.wind.drag(self.velocity) / self.mass
 
         # if we're on the ground, then our vertical acceleration is limited
         # to zero. This effectively adds the force of the ground on the aircraft