fix(CustomViewportOverlay): pass accurate data to Custom Viewport Functions (#4224)

Co-authored-by: Michael Andersen <Michael.Andersen@rmp.uhn.ca>
Co-authored-by: Bill Wallace <wayfarer3130@gmail.com>

extensions/default/src/getCustomizationModule.tsx

@@ -167,7 +167,6 @@ export default function getCustomizationModule({ servicesManager, extensionManag
         },
         {
           id: 'studyBrowser.sortFunctions',
-          merge: 'Append',
           values: [
             {
               label: 'Series Number',