Allow non-GTID replication without rewrite_src

The filter allowed only GTID replication when file-and-position based
replication should be allowed as well.

server/modules/filter/binlogfilter/binlogfiltersession.cc

@@ -139,7 +139,7 @@ int BinlogFilterSession::routeQuery(GWBUF* pPacket)
         m_state = BINLOG_MODE;
         MXS_INFO("Slave server %u is waiting for binlog events.", m_serverid);
 
-        if (!m_is_gtid)
+        if (!m_is_gtid && m_filter.getConfig().rewrite_src)
         {
             gwbuf_free(pPacket);
             std::ostringstream ss;