[FIX] l10n_cl: placeholder not working on res_partner

The overriding of the placeholder does not work.
It's done to be different than the standard translation (Ciudad).
Modified it to be standard way of overriding placeholders.
Linked to runbot error 6175

closes odoo/odoo#132833

Signed-off-by: Habib Ayob (ayh) <ayh@odoo.com>

addons/l10n_cl/views/res_partner.xml

@@ -10,7 +10,7 @@
                 <attribute name="placeholder">Datos adic. dirección y Ciudad</attribute>
             </field>
             <field name="city" position="attributes">
-                <attribute name="attrs">{'placeholder': 'Comuna'}</attribute>
+                <attribute name="placeholder">Comuna</attribute>
             </field>
             <field name="state_id" position="attributes">
                 <attribute name="placeholder">Región</attribute>