Meets  #16342: Refactor WorkPackages::Bulk and WorkPackages::Moves controllers into common service

[``* `#16342` Refactor WorkPackages::Bulk and WorkPackages::Moves controllers into common service``](https://www.openproject.org/work_packages/16342)
Unused method argument - `save_wp`. If it's necessary, use `_` or `_save_wp` as an argument name to indicate that it won't be used.<br>Surrounding space missing in default value assignment.