about: add TOS branch string to about-get call response
https://forum.turris.cz/t/pozadavek-namet-na-rozsireni-menu-foris-o-zarizeni/11027
Get current branch from uci.
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https://forum.turris.cz/t/pozadavek-namet-na-rozsireni-menu-foris-o-zarizeni/11027
Get current branch from uci.