search: unnecessary `decode('utf-8')` removal
search: unnecessary `decode('utf-8')` removal

Signed-off-by: Esteban J. G. Gabancho <03cb568148df368b792a31d9c4d06b12dc802700@gmail.com>

tiborsimko/invenio-search,inveniosoftware/invenio-search,inveniosoftware/invenio-search,tiborsimko/invenio-search