fix: settings "Cancel" button doesn't work first time (#5229)

src/widgets/settingspages/SettingsPage.hpp

@@ -56,8 +56,6 @@ public:
     SettingsDialogTab *tab() const;
     void setTab(SettingsDialogTab *tab);
 
-    void cancel();
-
     QCheckBox *createCheckBox(const QString &text,
                               pajlada::Settings::Setting<bool> &setting);
     QComboBox *createComboBox(const QStringList &items,
@@ -86,7 +84,6 @@ public:
 
 protected:
     SettingsDialogTab *tab_{};
-    pajlada::Signals::NoArgSignal onCancel_;
     pajlada::Signals::SignalHolder managedConnections_;
 };