AP_MotorsOctaQuad: call normalise_rpy_factors in motor setup

libraries/AP_Motors/AP_MotorsOctaQuad.cpp

@@ -70,4 +70,7 @@ void AP_MotorsOctaQuad::setup_motors()
         add_motor(AP_MOTORS_MOT_7,  135, AP_MOTORS_MATRIX_YAW_FACTOR_CCW, 4);
         add_motor(AP_MOTORS_MOT_8, -135, AP_MOTORS_MATRIX_YAW_FACTOR_CW,  6);
     }
+
+    // normalise factors to magnitude 0.5
+    normalise_rpy_factors();
 }