Qt: Remove unused signal in SettingsWindow

And fix a typo.

src/duckstation-qt/advancedsettingswidget.cpp

@@ -124,7 +124,7 @@ void AdvancedSettingsWidget::onAnyLogSinksChanged()
 void AdvancedSettingsWidget::onShowDebugOptionsStateChanged()
 {
   const bool enabled = QtHost::ShouldShowDebugOptions();
-  emit m_dialog->debugOptionsVisibiltyChanged(enabled);
+  emit m_dialog->debugOptionsVisibilityChanged(enabled);
 }
 
 void AdvancedSettingsWidget::refreshWebCacheSize()

src/duckstation-qt/graphicssettingswidget.cpp

@@ -63,7 +63,7 @@ GraphicsSettingsWidget::GraphicsSettingsWidget(SettingsWindow* dialog, QWidget*
 
   // Rendering Tab
 
-  connect(m_dialog, &SettingsWindow::debugOptionsVisibiltyChanged, this,
+  connect(m_dialog, &SettingsWindow::debugOptionsVisibilityChanged, this,
           &GraphicsSettingsWidget::onShowDebugSettingsChanged);
 
   if (!m_dialog->isPerGameSettings())

src/duckstation-qt/mainwindow.cpp

@@ -2809,7 +2809,7 @@ SettingsWindow* MainWindow::getSettingsWindow()
   if (!m_settings_window)
   {
     m_settings_window = new SettingsWindow();
-    connect(m_settings_window, &SettingsWindow::debugOptionsVisibiltyChanged, this,
+    connect(m_settings_window, &SettingsWindow::debugOptionsVisibilityChanged, this,
             &MainWindow::updateDebugMenuVisibility);
   }
 

src/duckstation-qt/settingswindow.cpp

@@ -270,7 +270,7 @@ void SettingsWindow::connectUi()
   if (!isPerGameSettings())
   {
     // must be a queued connection, since this comes from a control on the widget
-    connect(this, &SettingsWindow::debugOptionsVisibiltyChanged, this, &SettingsWindow::reloadPages,
+    connect(this, &SettingsWindow::debugOptionsVisibilityChanged, this, &SettingsWindow::reloadPages,
             Qt::QueuedConnection);
   }
 }

src/duckstation-qt/settingswindow.h

@@ -88,8 +88,7 @@ public:
   void setCategory(const char* category);
 
 Q_SIGNALS:
-  void settingsResetToDefaults();
-  void debugOptionsVisibiltyChanged(bool enabled);
+  void debugOptionsVisibilityChanged(bool enabled);
 
 protected:
   void closeEvent(QCloseEvent* event) override;