PrintSupport: Layout constructor already uses "this"

Not necessary to call setLayout here.

Change-Id: I761215b46ab4f778786e92338906b5ec7515c53d
Reviewed-by: David Faure <david.faure@kdab.com>

src/printsupport/dialogs/qprintdialog_unix.cpp

@@ -245,7 +245,6 @@ QPrintPropertiesDialog::QPrintPropertiesDialog(QAbstractPrintDialog *parent)
 {
     setWindowTitle(tr("Printer Properties"));
     QVBoxLayout *lay = new QVBoxLayout(this);
-    this->setLayout(lay);
     QWidget *content = new QWidget(this);
     widget.setupUi(content);
     m_buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, Qt::Horizontal, this);