ftpserver.pl: Extended the full text reply regular expression

Extended the regex to include other valid characters such as those used
in the reply text of Test 836.

tests/ftpserver.pl

@@ -2760,7 +2760,7 @@ sub customize {
     logmsg "FTPD: Getting commands from log/ftpserver.cmd\n";
 
     while(<CUSTOM>) {
-        if($_ =~ /REPLY \"([A-Z]+ [A-Za-z0-9+-\/=\*]+)\" (.*)/) {
+        if($_ =~ /REPLY \"([A-Z]+ [A-Za-z0-9+-\/=\*. ]+)\" (.*)/) {
             $fulltextreply{$1}=eval "qq{$2}";
             logmsg "FTPD: set custom reply for $1\n";
         }