Fix AttributeError when creating host with group

This was just a typo...
It should be AnsibleGroup instead of AnsibleQuery...

JIRA INFRA-548

app/network/views.py

@@ -66,7 +66,7 @@ def create_host():
     if form.validate_on_submit():
         network_id = form.network_id.data
         ansible_groups = [
-            models.AnsibleQuery.query.get(id_) for id_ in form.ansible_groups.data
+            models.AnsibleGroup.query.get(id_) for id_ in form.ansible_groups.data
         ]
         host = models.Host(
             name=form.name.data,