dos: We can put less token than the current amount

Becasue the circuit creation burst and rate can change at runtime it is
possible that between two refill of a bucket, we end up setting the bucket
value to less than there currently is.

Fixes #25128

Signed-off-by: David Goulet <dgoulet@torproject.org>

src/or/dos.c

@@ -308,8 +308,6 @@ cc_stats_refill_bucket(cc_client_stats_t *stats, const tor_addr_t *addr)
     new_circuit_bucket_count = MIN(stats->circuit_bucket + (uint32_t)num_token,
                                    dos_cc_circuit_burst);
   }
-  /* This function is not allowed to make the bucket count smaller */
-  tor_assert_nonfatal(new_circuit_bucket_count >= stats->circuit_bucket);
   log_debug(LD_DOS, "DoS address %s has its circuit bucket value: %" PRIu32
                     ". Filling it to %" PRIu32 ". Circuit rate is %" PRIu64
                     ". Elapsed time is %" PRIi64,