BUG/MINOR: fix missing "log-format overrides previous 'option tcplog clf'..." detection

In commit fd48b28 ("MINOR: Implements new log format of option tcplog clf")
"option tcplog clf" detection was correcly added for "option tcplog" and
"option httplog", but "log-format" case was overlooked. Thus, this config
would report erroneous warning message:

  defaults
    option tcplog clf
    log-format "ok"

[WARNING]  (727893) : config : parsing [test.conf:3]: 'log-format' overrides previous 'log-format' in 'defaults' section.

No backport needed unless fd48b28 is.

Author: Darlelet

src/cfgparse-listen.c

@@ -2699,6 +2699,8 @@ int cfg_parse_listen(const char *file, int linenum, char **args, int kwm)
 				oldlogformat = "option httplog";
 			else if (curproxy->logformat.str == default_tcp_log_format)
 				oldlogformat = "option tcplog";
+			else if (curproxy->logformat.str == clf_tcp_log_format)
+				oldlogformat = "option tcplog clf";
 			else if (curproxy->logformat.str == clf_http_log_format)
 				oldlogformat = "option httplog clf";
 			else if (curproxy->logformat.str == default_https_log_format)