Bug 4969: Toggle showing of all/active vendors

Bug 4969: Toggle showing of all/active vendors

This patch provides the functionality to hide inactive vendors from the
vendor search.

To test:
1) Make sure at least one vendor is inactive
2) Do a vendor search
3) Confirm the link to show only active vendors works, and is replaced
with a link to show all vendors when clicked
4) Confirm the link to show all vendors works, and is replaced with a
link to show only active vendors when clicked

Sponsored-by: Catalyst IT
Followed test plan, works as expected
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>