Replace logo-text-version* with logo-text* equivalents in testing/unstable

Simon McVittierequested to merge
smcv/desktop-base-temp:bug1086954 into master

During the development cycle for a new Debian release, there is no version number that is applicable, so in contexts that would normally display the logo with distro name and version (such as gdm), use the version with only the distro name instead.

Closes: #1086954

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