Fixed a couple of FIXMEs from the previous commit.

See [here](https://github.com/jdickey/interactor_demo/commit/5dade56b36ea57ae553964548a8277ae219c299c#commitcomment-5961390) regarding then-line 41 of `spec/controllers/blog/posts_controller_spec.rb` and [here](https://github.com/jdickey/interactor_demo/commit/5dade56b36ea57ae553964548a8277ae219c299c#commitcomment-5961466) regarding then-line 7 of `spec/views/blog/blog/index.html.haml_spec.rb`.

RSpec: 74 examples, 0 failures
Script: 0 tests: 0 failures, 0 errors, 0 pending, 0 omitted
RuboCop: 28 files inspected, no offenses detected
RuboCop global overrides in `.rubocop.yml`: 4
RuboCop local overrides in source and own specs: 1