Fix loop bound in clearing text facet
Fix loop bound in clearing text facet

The loop bounds are incorrect, so if the word isn't found (which is
currently happening with quoted things), the loop will terminate with
an exception due to `i` being out of bounds for `splitKeywords`, so it
tries to call `undefined.toString()`.

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