10999 fix power utilization on Device detail

Author: arthanson

netbox/templates/dcim/device.html

@@ -229,7 +229,7 @@ <h5 class="card-header">
                                 <th>Utilization</th>
                             </tr>
                             {% for powerport in object.powerports.all %}
-                                {% with utilization=powerport.get_power_draw powerfeed=powerport.connected_endpoint %}
+                                {% with utilization=powerport.get_power_draw powerfeed=powerport.connected_endpoints.0 %}
                                     <tr>
                                         <td>{{ powerport }}</td>
                                         <td>{{ utilization.outlet_count }}</td>