tst_QSpinBox: handle an old TODO

QTBUG-69492 has been fixed since Qt 5.12.

Pick-to: 6.6 6.5
Change-Id: I8bc59bd37a9ee2f47f13fa8ff54aa91e2c9148fa
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

tests/auto/widgets/widgets/qspinbox/tst_qspinbox.cpp

@@ -1830,10 +1830,6 @@ void tst_QSpinBox::stepModifierPressAndHold()
     spin.setStyle(stepModifierStyle.data());
 
     QSignalSpy spy(&spin, &SpinBox::valueChanged);
-    // TODO: remove debug output when QTBUG-69492 is fixed
-    connect(&spin, &SpinBox::valueChanged, [=]() {
-        qDebug() << QTime::currentTime() << "valueChanged emitted";
-    });
 
     spin.show();
     QVERIFY(QTest::qWaitForWindowActive(&spin));