fix_code_style limits to 120 chars instead of 100

it would still be good to limit code line length to 100 when writing the code,
but setting this to something larger avoids stupid automatic wrappings that make things less readable...
[airborne] fix code style on (nearly) all files

```
find sw/airborne/ -regextype posix-extended -regex 'sw/airborne/.*(chibios-libopencm3|lpcusb|efsl|lpc21/include|lpc21/test/bootloader|subsystems/ahrs)' -prune -o -name '*.[ch]' -exec ./fix_code_style.sh {} +
```

ignored ahrs (for now) to not create unnecessary conflicts for some pending changes..