[IMP] website: improve autocomplete dropdown UI

- Before this commit, Autocomplete dropdown ui is not
compatible with existing editor ui.
- After this, Autocomplete dropdown UI for url and GMAP imrpoved.

closes odoo/odoo#60735

Taskid: 2352870
Closes: https://github.com/odoo/odoo/pull/60735


Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>