Show changes when events' panels are changed

We were keeping events synced with their panels, but they weren't showing up in the schedule changes list because we weren't also synced the last_updated value. This should fix that!

uber/models/panels.py

@@ -149,11 +149,13 @@ class PanelApplication(MagModel):
 
     @presave_adjustment
     def update_event_info(self):
-        if self.event:
+        if self.event and any([getattr(self.event, key, '') != getattr(self, key, '') for key in [
+                'name', 'description', 'public_description', 'track']]):
             self.event.name = self.name
             self.event.description = self.description
             self.event.public_description = self.public_description
             self.event.track = self.track
+            self.event.last_updated = self.last_updated
 
     @presave_adjustment
     def set_default_dept(self):