Swap @budget instance variable for a let
Swap @budget instance variable for a let

Why:

Avoid instance variables as we agreed upon with RSpec/InstanceVariable

How:

Using a let(:budget) and replacing all `@budget` with `budget`

AyuntamientoPuertoReal/decidePuertoReal,deivid-rodriguez/participacion,usabi/consul_san_borondon,consul/consul,usabi/consul_san_borondon,consul/consul,usabi/consul_san_borondon,AyuntamientoMadrid/consul,AyuntamientoMadrid/participacion,AyuntamientoMadrid/participacion,lalibertad/consul,AyuntamientoPuertoReal/decidePuertoReal,consul/consul,deivid-rodriguez/participacion,AjuntamentdeCastello/consul,CDJ11/CDJ,AyuntamientoMadrid/participacion,AyuntamientoMadrid/participacion,AyuntamientoPuertoReal/decidePuertoReal,CDJ11/CDJ,AjuntamentdeCastello/consul,lalibertad/consul,CDJ11/CDJ,AyuntamientoMadrid/consul,lalibertad/consul,consul/consul,usabi/consul_san_borondon,lalibertad/consul,deivid-rodriguez/participacion,consul/consul,AyuntamientoMadrid/consul,AyuntamientoMadrid/consul,CDJ11/CDJ,AjuntamentdeCastello/consul,deivid-rodriguez/participacion,AjuntamentdeCastello/consul