[FIX] web: improve visual glitch for 'many2many_tags' field widget on settings view
[FIX] web: improve visual glitch for 'many2many_tags' field widget on settings view

 - For 'res.config.setting' view, when there is a field with
'many2many_tags' widget, a drop-down is not displayed
properly. (For example, see 'default_cashbox_lines_ids'
field from point_of_sale module)

 - This commit fixes the above visual glitch by properly displaying
the field having 'many2many_tags' widget on settings view.

Task id - 1935608

closes odoo/odoo#30956
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo