Fix recent data submitters in satellite page

The intent of the "5 recent submitters" on the satellite page is to show the 5 most recent stations and their last submitted time, whereas this was showing the last 5 submissions regardless of the ground station.

Signed-off-by: Corey Shields <cshields@gmail.com>

db/base/views.py

@@ -167,7 +167,7 @@ def satellite(request, norad):
     try:
         # pull the last 5 observers and their submission timestamps for this satellite
         recent_observers = DemodData.objects.filter(satellite=satellite_obj) \
-            .values('observer', 'timestamp').annotate(latest_payload=Max('timestamp')) \
+            .values('observer').annotate(latest_payload=Max('timestamp')) \
             .order_by('-latest_payload')[:5]
     except (ObjectDoesNotExist, IndexError):
         recent_observers = ''

db/templates/base/satellite.html

@@ -258,7 +258,7 @@
                   {% for obs in recent_observers %}
                   <tr>
                     <td>{{obs.observer}}</td>
-                    <td>{{obs.timestamp|date:"Y-m-d H:i:s"}} UTC</td>
+                    <td>{{obs.latest_payload|date:"Y-m-d H:i:s"}} UTC</td>
                   </tr>
                   {% endfor %}
                 </tbody>