Update airtime_mvc/public/js/airtime/preferences/streamsetting.js

Update statement to remove "disabled" attribute to be compatible with chrome and firefox browser.

Perform commit in devel branc as requested in: https://github.com/sourcefabric/Airtime/pull/21#issuecomment-11144375
Merge branch 'patch-2' of https://github.com/havban/Airtime into devel
Merge branch 'devel' of dev.sourcefabric.org:airtime into devel