refresh image data vhen truncating series

atlas/api.py

@@ -271,6 +271,9 @@ def series_truncate(request, series_id: int, start: int, end: int):
             image.image = None
             image.save()
             images_removed.append(image.pk)
+    
+    series.get_total_image_size(refresh=True)
+
     return {"status": "success", "images_removed": images_removed}