[FIX] account_chart_update: do not match twice the same repartition line

When updating a tax with several repartition lines, the same existing
candidates were considered in all iteration which could lead the wizard
to match the same repartition line with different lines of the template
and not detecting any change to do.

account_chart_update/wizard/wizard_chart_update.py

@@ -464,6 +464,7 @@ class WizardUpdateChartsAccounts(models.TransientModel):
             existing_candidates = current_repartition.filtered(
                 lambda r: r.factor_percent == factor_percent
                 and r.repartition_type == repartition_type
+                and r.id not in existing_ids
             )
             if len(existing_candidates) == 1:
                 existing = existing_candidates