Also adjust file name

The sources.list has been extracted from a Trisquel livecd and
a whitespace issue was fixed along the way.

BugLink: https://trisquel.info/en/issues/28007


Authored-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Co-Authored-by: Pablo Correa Gómez <ablocorrea@hotmail.com>

Pablo Correa authored 3 years ago and Luis Guzmán committed 3 years ago

See https://trisquel.info/en/issues/20736 for further details