[FIX] account_fiscal_year_closing - create/write

When coming from a template, Mapping is used as an Array instead of simple id (due to many in another many).
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