[core] fix listener's cookie check (#2176).

If a cookie from the caller HS conclusion response does not match the current listener's cookie, check the one that would have been generated a minute ago by the listener.

srtcore/core.cpp

@@ -10610,7 +10610,7 @@ int32_t srt::CUDT::bake(const sockaddr_any& addr, int32_t current_cookie, int co
                     clientport,
                     sizeof(clientport),
                     NI_NUMERICHOST | NI_NUMERICSERV);
-        int64_t timestamp = (count_microseconds(steady_clock::now() - m_stats.tsStartTime) / 60000000) + distractor -
+        int64_t timestamp = (count_microseconds(steady_clock::now() - m_stats.tsStartTime) / 60000000) + distractor +
                             correction; // secret changes every one minute
         stringstream cookiestr;
         cookiestr << clienthost << ":" << clientport << ":" << timestamp;