Fix Rails/ActionFilter spec
Fix Rails/ActionFilter spec

The default config for the Rails/ActionFilter cop tells it to operate
only on controllers (`{ 'Include' => ['app/controllers/**/*.rb'] }`),
causing it to *not* operate on the temporary files generated by the
spec. Nullifying the `Include` configuration option in the spec makes
the spec pass.

jonas054/rubocop,jonas054/rubocop