[Pkg-xmpp-devel] Unify maintainer address

[Boris Pek]

Hi,

> currently, 36 packages use pkg-xmpp-devel at lists.alioth.debian.org,
> while 5 use pkg-xmpp-devel at alioth-lists.debian.net. According to
> https://lists.debian.org/debian-devel/2018/10/msg00004.html it is
> better to keep the former address.
>
> I suggest to change it in prosody, prosody-modules, psi-plus,
> psi-plus-l10n, and qxmpp, on occasion.

Ok, I'll revert related changes in psi-plus and psi-plus-l10n
and will set pkg-xmpp-devel at l.a.d.o in qxmpp in the next uploads.

Best regards,
Boris