Fix servo assignments

In our original servo assignments, two of the CPN servos were set to act
as servo 7. This clashed with the PWM outputs to the PLB (for which
servo 7 and servo 14 are routed from the cube).  To fix this, we meant
to reassign Servo 7 to Servo 11.

I accidentally reassigned Servo 6 instead of Servo 7

SW-181

libraries/AP_HAL_ChibiOS/hwdef/CarbonixCubeOrange/defaults.parm

@@ -4,11 +4,11 @@ SERVO2_FUNCTION 34 @READONLY
 SERVO3_FUNCTION 35 @READONLY
 SERVO4_FUNCTION 36 @READONLY
 SERVO5_FUNCTION 70 @READONLY
-SERVO7_FUNCTION 21 @READONLY
+SERVO6_FUNCTION 19 @READONLY
 SERVO8_FUNCTION -1 @READONLY
 SERVO9_FUNCTION 94 @READONLY
 SERVO10_FUNCTION 4 @READONLY
-SERVO11_FUNCTION 19 @READONLY
+SERVO11_FUNCTION 21 @READONLY
 EK3_ENABLE 1 @READONLY
 BRD_SAFETYOPTION 3 @READONLY
 BATT2_MONITOR 28 @READONLY