Remove manual database lock usage

src/function/sync/apply-actions/dispatch-parent-action/removeuser.ts

@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 - 2020 Jonas Lochmann
+ * Copyright (C) 2019 - 2021 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -106,8 +106,7 @@ export async function dispatchRemoveUser ({ action, cache, parentUserId }: {
         familyId: cache.familyId,
         childId: action.userId
       },
-      transaction: cache.transaction,
-      lock: Sequelize.Transaction.LOCK.UPDATE
+      transaction: cache.transaction
     })
 
     await cache.database.categoryApp.destroy({