[Minor] ratelimit: remove max_rcpt from config

conf/modules.d/ratelimit.conf

@@ -37,7 +37,6 @@ ratelimit {
   #info_symbol = "R_RATELIMIT_INFO";
 
   whitelisted_rcpts = "postmaster,mailer-daemon";
-  max_rcpt = 5;
 
   .include(try=true,priority=5) "${DBDIR}/dynamic/ratelimit.conf"
   .include(try=true,priority=1,duplicate=merge) "$LOCAL_CONFDIR/local.d/ratelimit.conf"