Fix keyboard navigation inside search box
Fix keyboard navigation inside search box

Fixes zendesk #5591

alphagov/static,robinwhittleton/static,robinwhittleton/static,tadast/static,kalleth/static,robinwhittleton/static,tadast/static,alphagov/static,kalleth/static,tadast/static,kalleth/static,kalleth/static,robinwhittleton/static,alphagov/static,tadast/static