LP1687545: Force TT CGI plugin to use ampersands in query strings

LP1687545: Force TT CGI plugin to use ampersands in query strings

Change our already-forked version of TemplateToolkit::Plugin::CGI
to use "old" style urls which became the new / only style after
CGI.pm was deprecated. This causes the query_strings property to
consistently use ampersands to separate query parameters.

Signed-off-by: Jason Boyer <JBoyer@equinoxinitiative.org>
Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Chris Sharp <csharp@georgialibraries.org>