[DRE-maint] Bug#986286: disporta-installer 0.7.15

[Narcis Garcia]

This guide recommends to use buster-backports repositories on Stable
installations:
https://wiki.debian.org/Diaspora

Please update buster-backports with this fixed package.

-- 

Narcis Garcia

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I'm using this dedicated address because personal addresses aren't
masked enough at this tracker archive. Public archive administrator
should fix this against automated addresses collectors.