[FIX] account_fiscal_year_closing - create/write

When creating from scratch, Mapping is used as an Array instead of simple id (due to many in another many).
When coming from a template, id is used
To take into account this particularity, check the type before taking the id of the array.

account_fiscal_year_closing/models/account_fiscalyear_closing.py

@@ -553,13 +553,13 @@ class AccountFiscalyearClosingMapping(models.Model):
 
     @api.model
     def create(self, vals):
-        if "dest_account_id" in vals:
+        if "dest_account_id" in vals and type(vals["dest_account_id"]) == list:
             vals["dest_account_id"] = vals["dest_account_id"][0]
         res = super(AccountFiscalyearClosingMapping, self).create(vals)
         return res
 
     def write(self, vals):
-        if "dest_account_id" in vals:
+        if "dest_account_id" in vals and type(vals["dest_account_id"]) == list:
             vals["dest_account_id"] = vals["dest_account_id"][0]
         res = super(AccountFiscalyearClosingMapping, self).write(vals)
         return res