Ensure that rcRate great than 1.0 doesn't cause stability issues when

aircraft is inverted.  See #281.

src/main/flight/flight.c

@@ -189,7 +189,8 @@ static void pidMultiWii(pidProfile_t *pidProfile, controlRateConfig_t *controlRa
     UNUSED(controlRateConfig);
 
     // **** PITCH & ROLL & YAW PID ****
-    prop = max(abs(rcCommand[PITCH]), abs(rcCommand[ROLL])); // range [0;500]
+    prop = min(max(abs(rcCommand[PITCH]), abs(rcCommand[ROLL])), 500); // range [0;500]
+
     for (axis = 0; axis < 3; axis++) {
         if ((FLIGHT_MODE(ANGLE_MODE) || FLIGHT_MODE(HORIZON_MODE)) && (axis == FD_ROLL || axis == FD_PITCH)) { // MODE relying on ACC
             // observe max inclination