v0.15.1 release.

`bitcoin-qt` opens the wrong conf file when a conf file is specified with `-conf={file}`

Key:

    >bitcoin-qt -conf=altconf.conf

Go to: Settings --> Options --> Open Configuration File --> OK

Editor opens with `default.conf` instead. Should open specified conf, also using `-datadir={folder path}` parameter which I have not checked.
}
    
    QString result = QDir::toNativeSeparators(QFileDialog::getSaveFileName(parent, caption, myDir, filter, &selectedFilter));
    
    QRegExp filter_re(".* \\(\\*\\.(.*)[ \\)]");
    QString selectedSuffix;
    if(filter_re.exactMatch(selectedFilter))
    {
        selectedSuffix = filter_re.cap(1);
    }
    
    QFileInfo info(result);
    if(!result.isEmpty())
    {
        if(info.suffix().isEmpty() && !selectedSuffix.isEmpty())
        {
            
            if(!result.endsWith("."))
                result.append(".");
            result.append(selectedSuffix);
        }
    }
    
    if(selectedSuffixOut)
    {
        *selectedSuffixOut = selectedSuffix;
    }
    return result;
}
QString getOpenFileName(QWidget *parent, const QString &caption, const QString &dir,