Bug 8288 - showmarc.tt should not include full doc-head-close.inc

Bug 8288 - showmarc.tt should not include full doc-head-close.inc

showmarc.tt and opac-showmarc.tt are used to load a plain view
of a MARC record and thus do not need the full set of page assets
loaded with other pages (CSS and JavaScript). Removing the
standard doc-head-close include will reduce the load time of
these pages.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>