Make keyword search label/input ID unique
Make keyword search label/input ID unique

The ID of #search was clashing with form#search in the base template.

Make it unique to make the label behaviour work as expected, and make
it specific to finders to avoid similar clashes in the future (as
govuk_template  and/or static can change undernear the app without
warning)

alphagov/finder-frontend,alphagov/finder-frontend,alphagov/finder-frontend,alphagov/finder-frontend