search: fix for stucked focus on the search field

• Prevents setting the caret position by typeahead on blur event. Changing the caret position in this situation is not needed, and causes the field to focus back.

Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>
Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>