LIST command with -a

Hey,

some FTP clients use "LIST -a" to list all in the root dir.
So I added it to FtpControlConnection::stripFlagL.
`QString FtpControlConnection::stripFlagL(const QString &fileName)
{
    QString a = fileName.toUpper();
    if (a == "-L" || a == "-A") {
        return "";
    }
    if (a.startsWith("-L ")) {
        return fileName.mid(3);
    }
    return fileName;
}`