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)
Redundant curly braces around a hash parameter.<br>Use the new Ruby 1.9 hash syntax.