folder admin: add missing search results querysets to context
folder admin: add missing search results querysets to context

search_form.html template makes use of these variables, but they were
not set in the context.

DylannCordel/django-filer,skirsdeda/django-filer,jakob-o/django-filer,skirsdeda/django-filer,skirsdeda/django-filer,stefanfoulis/django-filer,divio/django-filer,divio/django-filer,jakob-o/django-filer,webu/django-filer,webu/django-filer,jakob-o/django-filer,DylannCordel/django-filer,DylannCordel/django-filer,stefanfoulis/django-filer,stefanfoulis/django-filer,webu/django-filer,divio/django-filer,divio/django-filer,DylannCordel/django-filer,stefanfoulis/django-filer,stefanfoulis/django-filer,webu/django-filer,jakob-o/django-filer,skirsdeda/django-filer,DylannCordel/django-filer,skirsdeda/django-filer,jakob-o/django-filer