removed unused function in SettingsDialog

src/widgets/dialogs/SettingsDialog.cpp

@@ -20,8 +20,6 @@
 
 namespace chatterino {
 
-SettingsDialog *SettingsDialog::instance_ = nullptr;
-
 SettingsDialog::SettingsDialog()
     : BaseWindow(BaseWindow::DisableCustomScaling)
 {
@@ -138,11 +136,6 @@ void SettingsDialog::filterElements(const QString &text)
     }
 }
 
-SettingsDialog *SettingsDialog::instance()
-{
-    return SettingsDialog::instance_;
-}
-
 void SettingsDialog::addTabs()
 {
     this->ui_.tabContainer->setMargin(0);

src/widgets/dialogs/SettingsDialog.hpp

@@ -34,7 +34,6 @@ class SettingsDialog : public BaseWindow
 public:
     SettingsDialog();
 
-    static SettingsDialog *instance();  // may be NULL
     static void showDialog(SettingsDialogPreference preferredTab =
                                SettingsDialogPreference::NoPreference);
 
@@ -44,18 +43,16 @@ protected:
     virtual void showEvent(QShowEvent *) override;
 
 private:
-    static SettingsDialog *instance_;
-
     void refresh();
 
     void initUi();
+    SettingsDialogTab *tab(SettingsTabId id);
     void addTabs();
     void addTab(std::function<SettingsPage *()> page, const QString &name,
                 const QString &iconPath, SettingsTabId id = {},
                 Qt::Alignment alignment = Qt::AlignTop);
     void selectTab(SettingsDialogTab *tab, const bool byUser = true);
     void selectTab(SettingsTabId id);
-    SettingsDialogTab *tab(SettingsTabId id);
     void filterElements(const QString &query);
 
     void onOkClicked();