EE - Advmame auto gamepad fixes 2.

[Langerz82]

EE - Advmame auto gamepad fixes 2.

1. Fix for different controllers using hat values.
2. Added support for flipping only certain controller axis's.
   ex:

echo "1 2" > /storage/.config/JP_ADVMAME_INVERT_AXIS

Will flip the axis only for player 1, and player 2's controllers.
3. Some whitespace fixes so its a bit more readable.

To test in SSH:

cd /emuelec/bin
wget https://raw.githubusercontent.com/Langerz82/EmuELEC/8a53e0914091644f93440858d9f134ddf79ae843/packages/sx05re/emulators/advancemame/bin/set_advmame_joy.sh
chmod +x /emuelec/bin/set_advmame_joy.sh

Should now use updated auto gamepad script.