Use protocol relative URLs for some links on Transparency Report pages

Some links on the Wikimedia Foundation Transparency Report have hard coded
"http:" as their protocol. I changed them to protocol relative links
(those start with "//"). The links with hard coded https are not changed
to protocol relative.

Change-Id: Id2b651cb64cf803bf87cb7d5e25ea350a944474f
Merge "Use protocol relative URLs for some links on Transparency Report pages"