Fix build against Qt6

uics/ui_settingsdialog.h: In member function ‘void Ui_settingsDialog::setupUi(QDialog*)’: uics/ui_settingsdialog.h:2442:25: error: no matching function for call to ‘QObject::connect(QSlider*&, void (QAbstractSlider::)(int), QLabel&, )’ 2442 | QObject::connect(horizontalSlider_soundVolume, &QSlider::valueChanged, label_soundVolume, &QLabel::setNum); | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/x86_64-linux-gnu/qt6/QtCore/qvariant.h:22,

ui_settingsdialog.h is an automatically generated file.

Change line 2442

From

QObject::connect(horizontalSlider_soundVolume, &QSlider::valueChanged, label_soundVolume, &QLabel::setNum);

to

QObject::connect(horizontalSlider_soundVolume, &QSlider::valueChanged, label_soundVolume, qOverload(&QLabel::setNum));