Add Musées de la Haute-Saône to wgCopyUploadsDomains

This patch changes in the whitelist $wgCopyUploadsDomains the domain
of the production web-server of the Musées de la Haute-Saône (France)
(so as to enable mass collection uploads on Wikimedia Commons
using the GlamWikiToolset).

It appeared whitelisting *.musees.cg70.fr was not sufficient to allow
uploads from musees.cg70.fr due to how MediaWiki match sources.
Thus adding the more specific entry 'musees.cg70.fr'.

Also added references to the bug report.

Follows-up on I0c60ef6d & I749f5fbc

Bug: 63449
Change-Id: Ifec1ae8d16482823bfc58f499669a52b5c48129c
Signed-off-by: Antoine Musso <hashar@free.fr>