Fix remaining email list address

One instance was missed in b0a2fd75

.
Signed-off-by: Allan McRae <allan@archlinux.org>

lib/libalpm/po/Makevars

@@ -15,7 +15,7 @@ XGETTEXT_OPTIONS = \
 # This is the copyright holder that gets inserted into the header of the
 # $(DOMAIN).pot file.  Set this to the copyright holder of the surrounding
 # package.
-COPYRIGHT_HOLDER = Pacman Development Team <pacman-dev@archlinux.org>
+COPYRIGHT_HOLDER = Pacman Development Team <pacman-dev@lists.archlinux.org>
 
 # This is the email address or URL to which the translators shall report
 # bugs in the untranslated strings.