Remove unused serialization functions

src/action/setcategoryforunassignedapps.ts

@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 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
@@ -38,12 +38,6 @@ export class SetCategoryForUnassignedAppsAction extends ParentAction {
     this.categoryId = categoryId
   }
 
-  serialize = (): SerializedSetCategoryForUnassignedAppsAction => ({
-    type: 'SET_CATEGORY_FOR_UNASSIGNED_APPS',
-    childId: this.childId,
-    categoryId: this.categoryId
-  })
-
   static parse = ({ childId, categoryId }: SerializedSetCategoryForUnassignedAppsAction) => (
     new SetCategoryForUnassignedAppsAction({ childId, categoryId })
   )