Bug 11796: fix display of search result facets if facet happens to have exactly six entries

If a search gives results with 6 facets, one of those facets won't be
displayed. This is due to a bug in the code that only considers great
than 6 facets in one area, and less than 6 in another.

Test Plan:
1) Perform a search that should give results for 6 different libraries
2) Note you only see 5 libraries in the facets with no option to expand
3) Apply this patch
4) Repeat step 1
5) Note you now have the option to expand the facets list

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
This patch should provide a regression test but I really don't know how
to write it.

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