Don't show focus rect for QCommandLinkButton

Since QPushButton sets WA_MacShowFocusRect attribute upon init, this
will be set for QCommandLinkButton too. However, we do not want to draw
the Mac focus frame for QCommandLink buttons so remove this attribute
for them.

Pick-to: 5.15 6.0
Change-Id: Ida7a437a54be078caaebc2c0744243d50e14a87f
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/widgets/widgets/qcommandlinkbutton.cpp

@@ -216,6 +216,7 @@ void QCommandLinkButtonPrivate::init()
     Q_Q(QCommandLinkButton);
     QPushButtonPrivate::init();
     q->setAttribute(Qt::WA_Hover);
+    q->setAttribute(Qt::WA_MacShowFocusRect, false);
 
     QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::PushButton);
     policy.setHeightForWidth(true);