Bug#922912: Update project URL

[積丹尼 Dan Jacobson]

Package: xdg-utils
Version: 1.1.3-1
Severity: minor
File: /usr/share/doc/xdg-utils/copyright

The project URL needs to be changed to
https://www.freedesktop.org/wiki/Software/xdg-utils/
from http://portland.freedesktop.org .