Bug 10840: restore OPACResultsSidebar in opac-facets.inc

Bug 10840: restore OPACResultsSidebar in opac-facets.inc

Bug 10405 rightly added id's to items, but inadvertently removed
[% OPACResultsSidebar %] from the opac-facets.inc file. This
bug rectifies that problem.

Test Plan:
Confirm the problem
===================
1) Set OPACResultsSidebar system preference to some text.
2) In the OPAC, search for something
3) The facets will not have the text, though viewing the source, there
   is an empty <div id="opacresultssidebar">.

Correct the problem
===================
1) Apply the patch to the master system
2) In the OPAC, search again for something
3) The facets on the left will now have the text from the
   OPACResultsSidebar system preference.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Is back! OPACResultsSidebar is back!

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Copied test plan from bug report into commit message.
Template only change, works as expected.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>