There were some custom routes created using the param[:id] but the
Rails routes use the param[:budget_id] by default, so the same
controller could be asked for different param keys.
Note that we are relying on the existing `sort_by_name`[1] method in the `Budget::Heading` class.
This method sorts by DESC group name first and then ASC heading name.
[1] https://github.com/AyuntamientoMadrid/consul/pull/1875
