[FIX] account: chart of account opening period selection

If a special period is present, it must be selected fist
Fixes #3946

addons/account/wizard/account_chart.py

@@ -51,7 +51,7 @@ class account_chart(osv.osv_memory):
                                FROM account_period p
                                LEFT JOIN account_fiscalyear f ON (p.fiscalyear_id = f.id)
                                WHERE f.id = %s
-                               ORDER BY p.date_start ASC
+                               ORDER BY p.date_start ASC, p.special DESC
                                LIMIT 1) AS period_start
                 UNION ALL
                 SELECT * FROM (SELECT p.id