In Textviewer when OS is in dark mode and AllowDarkTheme is enabled in config file use dark background and light text (no syntax highlighting). (#1238)

With AllowDarkTheme disabled (default) use light background and light mode syntax highlighting.

QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.cs

@@ -45,9 +45,6 @@ namespace QuickLook.Plugin.TextViewer
         {
             _context = context;
 
-            Background = OSThemeHelper.AppsUseDarkTheme()
-                ? new SolidColorBrush(Color.FromArgb(150, 255, 255, 255))
-                : Brushes.Transparent;
             FontSize = 14;
             ShowLineNumbers = true;
             WordWrap = true;