fix hr conversion

src/submission/submit.py

@@ -57,7 +57,7 @@ def add_new_solutions(
         now = datetime.now(timezone.utc)
         elapsed = now - user_last_submission_date
         if elapsed < timedelta(hours=MIN_WAIT_TIME_PER_USER_HRS):
-            remaining_hrs = (MIN_WAIT_TIME_PER_USER_HRS - elapsed.total_seconds()) / 3600
+            remaining_hrs = MIN_WAIT_TIME_PER_USER_HRS - elapsed.total_seconds() / 3600
             logger.info(f"{username} must wait {remaining_hrs:.2f} more hours.")
             return styled_error(
                 f"You must wait {MIN_WAIT_TIME_PER_USER_HRS} hours between submissions. "