Revert "Add missing Q_OBJECT to ShortcutSettingsWidget"

This reverts commit 254ec73940.

src/gui/ShortcutSettingsPage.cpp

@@ -38,8 +38,6 @@
 
 class KeySequenceDialog final : public QDialog
 {
-    Q_OBJECT
-
 public:
     explicit KeySequenceDialog(QWidget* parent = nullptr)
         : QDialog(parent)
@@ -91,8 +89,6 @@ private:
 
 class ShortcutSettingsWidget final : public QWidget
 {
-    Q_OBJECT
-
 public:
     explicit ShortcutSettingsWidget(QWidget* parent = nullptr)
         : QWidget(parent)