FIX sftp unlink path (#769)

auto_backup/__openerp__.py

@@ -7,7 +7,7 @@
 {
     "name": "Database Auto-Backup",
     "summary": "Backups database",
-    "version": "8.0.1.0.2",
+    "version": "8.0.1.0.3",
     "author": (
         "VanRoey.be - Yenthe Van Ginneken, Agile Business Group,"
         " Grupo ESOC Ingeniería de Servicios,"

auto_backup/models/db_backup.py

@@ -232,7 +232,7 @@ class DbBackup(models.Model):
                         for name in remote.listdir(rec.folder):
                             if (name.endswith(".dump.zip") and
                                     os.path.basename(name) < oldest):
-                                remote.unlink(name)
+                                remote.unlink('%s/%s' % (rec.folder, name))
 
     @api.multi
     @contextmanager