add comment for cache folder size refresh event

Author: jjw24

Flow.Launcher/SettingPages/ViewModels/SettingsPaneAboutViewModel.cs

@@ -265,6 +265,7 @@ private bool ClearCacheFolder()
             }
         }
 
+        // Raise regardless to cover scenario where size needs to be recalculated if the folder is manually removed on disk.
         OnPropertyChanged(nameof(CacheFolderSize));
 
         return success;