Fix issue with tournament creator in admin

tournaments/admin.py

@@ -42,7 +42,7 @@ class EventAdmin(admin.ModelAdmin):
     ordering = ['-creation_date']
 
 class TournamentAdmin(admin.ModelAdmin):
-    list_display = ['display_name', 'event', 'is_private', 'start_date', 'payment', 'event__creator']
+    list_display = ['display_name', 'event', 'is_private', 'start_date', 'payment', 'creator']
     list_filter = ['is_deleted', 'event__creator']
     ordering = ['-start_date']