spec: update rails-controller-testing to 1.0.4
spec: update rails-controller-testing to 1.0.4

https://github.com/rails/rails-controller-testing/compare/v1.0.2..v1.0.4

Change-Id: I6026e968a0d90851b7cb9e9fffafbe11dcbd933c
Reviewed-on: https://gerrit.instructure.com/200499
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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