Backport pull request #15446 from jellyfin/release-10.11.z

Fix AncestorIds not migrating

Original-merge: 177b6464ca1b6772a191dbf9c5595708f91fc0fa

Merged-by: crobibero <cody@robibe.ro>

Backported-by: Bond_009 <bond.009@outlook.com>

Jellyfin.Server/Migrations/Routines/MigrateLibraryDb.cs

@@ -383,8 +383,6 @@ internal class MigrateLibraryDb : IDatabaseMigrationRoutine
                     });
                 }
 
-                baseItemIds.Clear();
-
                 foreach (var item in peopleCache)
                 {
                     operation.JellyfinDbContext.Peoples.Add(item.Value.Person);