[FIX] web: Allow array value for many2many search filter

Issue:

  In an action, if we add to the context a key `search_default_x_ids`
  (who is a many2many field) with an array of ids as value, it will
  display/use only the first value in the search bar.

Cause:

  If filter-type is 'field' and it's an array, it will take the first
  value.

Solution:

  Take first value of array only if field-type is a `many2one`.

Inspired by Odoo v13.0

opw-2596345

closes odoo/odoo#74839

Signed-off-by: Julien Mougenot (jum) <jum@odoo.com>