fix: integrate correct AddCategories (#4926)

fixes duplication of AddCategories function.
calls the correct AddCategories function

#### Does this PR need a docs update or release note?
- [x] ⛔ No

#### Type of change
- [x] 🐛 Bugfix

#### Issue(s)
#4754 

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E

src/cli/backup/sharepoint.go

@@ -226,30 +226,11 @@ func sharePointBackupCreateSelectors(
 
 	sel := selectors.NewSharePointBackup(append(slices.Clone(sites), weburls...))
 
-	return addCategories(sel, cats), nil
+	return utils.AddCategories(sel, cats), nil
 }
 
 func includeAllSitesWithCategories(ins idname.Cacher, categories []string) *selectors.SharePointBackup {
-	return addCategories(selectors.NewSharePointBackup(ins.IDs()), categories)
-}
-
-func addCategories(sel *selectors.SharePointBackup, cats []string) *selectors.SharePointBackup {
-	// Issue #2631: Libraries are the only supported feature for SharePoint at this time.
-	if len(cats) == 0 {
-		sel.Include(sel.LibraryFolders(selectors.Any()))
-	}
-
-	for _, d := range cats {
-		switch d {
-		// [TODO] uncomment when lists are enabled
-		// case flags.DataLists:
-		// 	sel.Include(sel.Lists(selectors.Any()))
-		case flags.DataLibraries:
-			sel.Include(sel.LibraryFolders(selectors.Any()))
-		}
-	}
-
-	return sel
+	return utils.AddCategories(selectors.NewSharePointBackup(ins.IDs()), categories)
 }
 
 // ------------------------------------------------------------------------------------------------

src/cli/utils/sharepoint.go

@@ -69,7 +69,7 @@ func MakeSharePointOpts(cmd *cobra.Command) SharePointOpts {
 func SharePointAllowedCategories() map[string]struct{} {
 	return map[string]struct{}{
 		flags.DataLibraries: {},
-		// flags.DataLists:     {},
+		// flags.DataLists:     {}, [TODO]: uncomment when lists are enabled
 	}
 }