Move servos 1 and 2 to pins 10 and 5 on the NANOWII in FLYING_WING mode.

This is useful in flying wing / elevon mode, at least on
Felix Nessen's NanoWii and Hobby King's NanoWii.

On these boards, Arduino pins 10 and 5 map to the second
and third channels on the output rail that provides power and
ground pins next to each signal pin. The first channel is throttle.

FLYING_WING mode uses SERVO_1 and SERVO_2 as elevons, which by default
maps to Arduino pins A0 and A1, which are accessible on these boards,
but lack the convenient power and ground pins. This commit re-maps the pins
for SERVO_1 and SERVO_2 (and SERVO_5 and SERVO_7) in this situation.

This change is probably only beneficial to you if you use one of these
boards AND want to fly in elevon mode AND you choose to use pin headers
and standard servo connectors instead of soldering directly to the board.

AIRPLANE mode seems to map aileron, elevator and rudder to the second,
third and fourth channels (Arduino pins 10, 5, and 6) on the output rail
as desired, regardless of this change.

The throttle channel seems to map to the first channel on the output
rail in both AIRPLANE mode and FLYING_WING mode.

http://flyduino.net/documents/NanoWii_manual.pdf
http://www.hobbyking.com/hobbyking/store/__22322__MultiWii_NanoWii_ATmega32U4_Micro_Flight_Controller_USB_GYRO_ACC.html
http://multiwii.googlecode.com/svn/trunk/Doc/Diagrams/7%20Connection%20diagram%20flying%20wing.png