Put exception logging in the correct place

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

app/celery/scheduled_tasks.py

@@ -282,13 +282,15 @@ def process_delivery_receipts(self):
     except Exception as ex:
         retry_count = self.request.retries
         wait_time = 3600 * 2**retry_count
+
+        current_app.logger.exception(str(ex))
+
         try:
             raise self.retry(ex=ex, countdown=wait_time)
         except self.MaxRetriesExceededError:
             current_app.logger.error(
-                f"Failed process delivery receipts after max retries: {str(ex)}"
+                "Failed process delivery receipts after max retries"
             )
-            raise ex
 
 
 @notify_celery.task(