[master][chat] ShowHelpForSubCommand don't print command name

[cyberium]

If you type command who need subcommand like ".modify" without any subcommand then help not contain command name.

First in ChatHandler::ExecuteCommand(const char* text) :

We use

ChatCommandSearchResult res = FindCommand(getCommandTable(), text, command, &parentCommand);

This command modify "text" pointer so we cannot use it to point on current command.

But after somme line :

case CHAT_COMMAND_UNKNOWN_SUBCOMMAND:
       {
           SendSysMessage(LANG_NO_SUBCMD);
           ShowHelpForCommand(command->ChildCommands,text);
           SetSentErrorMessage(true);
           break;
       }