Show virtual chassis name in Deviceview card header; fix lint

- ports.html: use object.virtual_chassis.name when device is a VC member
  instead of the individual member device name
- tests/test_utils.py: reformat with black

Author: peterbaumert

netbox_device_view/templates/netbox_device_view/ports.html

@@ -27,7 +27,7 @@
 {% endblock %}
 {% block content %}
 <div class="card">
-	<h2 class="card-header">Deviceview {{ object.name }}</h2>
+	<h2 class="card-header">Deviceview {% if object.virtual_chassis %}{{ object.virtual_chassis.name }}{% else %}{{ object.name }}{% endif %}</h2>
 	<div class="card-body">
 		{% spaceless %}
 		{% if use_svg %}

tests/test_utils.py

@@ -311,7 +311,10 @@ def test_virtual_chassis_scopes_css(self, MockDV, MockCP):
         member2.modules.all.return_value = []
 
         dev = self._make_device(vc=MagicMock())
-        dev.virtual_chassis.members.select_related.return_value.all.return_value = [member1, member2]
+        dev.virtual_chassis.members.select_related.return_value.all.return_value = [
+            member1,
+            member2,
+        ]
 
         dv, modules, ports_chassis, device_view = prepare(dev)
 
@@ -339,7 +342,9 @@ def test_virtual_chassis_missing_member_device_view_returns_none(
         member.modules.all.return_value = []
 
         dev = self._make_device(vc=MagicMock())
-        dev.virtual_chassis.members.select_related.return_value.all.return_value = [member]
+        dev.virtual_chassis.members.select_related.return_value.all.return_value = [
+            member
+        ]
 
         dv, modules, ports_chassis, device_view = prepare(dev)