Set danger visual on supplier invoice when amount to pay is greater than 0

The amount to pay is always positive so the test must be "greater than 0".

Closes #14925
(grafted from e4e920cb9e7d2a2f3bfa86fad4e8c3025cb78828)

--HG--
branch : 7.0

modules/account_invoice/invoice.py

@@ -1356,11 +1356,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin, InvoiceReportMixin):
         return super().view_attributes() + [
             ('/form//field[@name="comment"]', 'spell', Eval('party_lang')),
             ('/tree', 'visual',
-                If((
-                        (Eval('type') == 'out')
-                        & (Eval('amount_to_pay_today', 0) > 0))
-                    | ((Eval('type') == 'in')
-                        & (Eval('amount_to_pay_today', 0) < 0)),
+                If(Eval('amount_to_pay_today', 0) > 0,
                     'danger',
                     If(Eval('state') == 'cancelled', 'muted', ''))),
             ]