Fix for Bug 5714 - Unescaped ampersands in OPAC facets

Fix for Bug 5714 - Unescaped ampersands in OPAC facets

In the OPAC the "query_cgi" variable passed to the template
outputs a string like this:

idx=kw&q=thing

The ampersand is unescaped. Adding an "|html" filter to
the variable. Also correcting some TT markup which
added a new validation error (an unopened <div>).

Signed-off-by: Magnus Enger <magnus@enger.priv.no>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit a53ae578b428a3cddd2802a972ee048b479a44aa)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>