Fix bit rate change
Fix bit rate change

Bit rate selector was ignored by scripts.

On [Chrome Web Store](https://chrome.google.com/webstore/detail/serial-projector/kbkjgbkmphnikcpkcodjbifkblmgidia/support?hl=uk)
page you can find complaints:

[George Bobrov](https://plus.google.com/110452802688340996863)
> Скорость везде 9600.
> Как предварительно отбайндить?:)

[Дмитрий Шестаков](https://plus.google.com/109083304348229294085)
> Не работают скорости выше 9600.

amperka/serial-projector,amperka/serial-projector