LP#2054128: OPAC autosuggest now gets closed when input loses focus

LP#2054128: OPAC autosuggest now gets closed when input loses focus

This patch ensure that the autosuggest list goes away when
the basic search box in the OPAC loses focus. Otherwise, it
can obscure controls that the user is trying to interact with.

To test
-------
[1] Enter a search term in the OPAC and observe that the
    dropdown of suggestions appears.
[2] Tab or click away from the input. Note that the dropdown
    remains open.
[3] Apply the patch and repeat steps 2 and 3. This time, the
    dropdown should get closed.

Release-note: Close autosuggest dropdown in the public catalog when it loses focus.

Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>