[PowerRename]Save data from the last run outside of the settings file (#28861)

* [PowerRename] Sync settings before saving last window size

* address review comments

src/modules/powerrename/PowerRenameUILib/PowerRenameXAML/MainWindow.xaml.h

@@ -153,6 +153,8 @@ namespace winrt::PowerRenameUI::implementation
         UINT m_selectedCount = 0;
         UINT m_renamingCount = 0;
         winrt::event<Microsoft::UI::Xaml::Data::PropertyChangedEventHandler> m_propertyChanged;
+        std::optional<std::pair<int,int>> m_updatedWindowSize;
+
 
         bool m_flagValidationInProgress = false;