libdpkg-perl: Fix Canonical copyright statement

The work Colin did was under Canonical's time.

Signed-off-by: Colin Watson <cjwatson@ubuntu.com>
Signed-off-by: Guillem Jover <guillem@debian.org>

scripts/Dpkg/Vendor/Ubuntu.pm

@@ -1,5 +1,6 @@
 # Copyright © 2008 Ian Jackson <ian@davenant.greenend.org.uk>
-# Copyright © 2008 Colin Watson <cjwatson@ubuntu.com>
+# Copyright © 2008 Canonical, Ltd.
+#   written by Colin Watson <cjwatson@ubuntu.com>
 # Copyright © 2008 James Westby <jw+debian@jameswestby.net>
 # Copyright © 2009 Raphaël Hertzog <hertzog@debian.org>
 #