Add is_deleted filter for tournament in admin

tournaments/admin.py

@@ -40,6 +40,7 @@ class TeamRegistrationAdmin(admin.ModelAdmin):
 
 class TournamentAdmin(admin.ModelAdmin):
     list_display = ['display_name', 'event', 'is_private', 'start_date', 'payment', 'is_canceled']
+    list_filter = ['is_deleted']
 
 class TeamScoreAdmin(admin.ModelAdmin):
     list_display = ['team_registration', 'score', 'walk_out', 'match']