Silence the UnorderedObjectListWarning warning for the workflow app.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/document_states/models.py

@@ -420,6 +420,7 @@ class WorkflowInstance(models.Model):
             return WorkflowTransition.objects.none()
 
     class Meta:
+        ordering = ('workflow',)
         unique_together = ('document', 'workflow')
         verbose_name = _('Workflow instance')
         verbose_name_plural = _('Workflow instances')