[FIX] public_budget_tax_settlement: compute amount residual

Ticket: 57510
Computo el amount_residual de esta manera porque nunca lo termina computando acá https://github.com/odoo/odoo/blob/15.0/addons/account/models/account_move.py#L1477

public_budget/models/account_move.py

@@ -188,10 +188,3 @@ def unlink(self):
         self.filtered(lambda x: x.move_type in x.get_purchase_types() and x.state in (
             'draft', 'cancel') and not x.l10n_latam_use_documents).write({'name': '/'})
         return super().unlink()
-
-    def _payment_state_matters(self):
-        # TODO KZ si no funciona podriamos intentar con open_move_line_ids si esta definido y viene seteado.
-        self.ensure_one()
-        if self.settled_line_ids:
-            return True
-        return super()._payment_state_matters()

public_budget_tax_settlement/models/__init__.py

@@ -1,4 +1,3 @@
 from . import account_move
 from . import account_payment
-from . import account_payment_group
 from . import account_move_line

public_budget_tax_settlement/models/account_move.py

@@ -38,6 +38,10 @@ def action_pay_tax_settlement(self):
 
     def _compute_matched_to_pay(self):
         for rec in self:
+            if self.line_ids and not self.payment_state and self.state == 'posted' and self.open_move_line_ids:
+                amount_residual = sum(self.line_ids.mapped('amount_residual'))
+                if amount_residual != 0:
+                    self.amount_residual = amount_residual
             rec.enable_to_pay = True if rec.amount_residual != 0 else False
 
     @api.model