spincontrol-disable-on-bounds style hint has no effect in QSpinBox style sheet

spincontrol-disable-on-bounds style sheet hint is not properly checked on QAbstractSpinBox instances.

Small testcase:

#include <QtWidgets>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    
    QSpinBox sb;
    // since the default is true in qcommonstyle, we have to set to 0 to see an effect
    sb.setStyleSheet("QSpinBox { spincontrol-disable-on-bounds: 0; } ");
    sb.show();
    
    return app.exec();
}

The problem is in the following method:
qabstractspinbox.cpp:
void QAbstractSpinBox::initStyleOption(QStyleOptionSpinBox *option) const

The call to styleHint() in this methid should pass "this" as a third argument.