Revert "Merge pull request #899 from gds/feedback-dont-intercept-503-for-report-a-problem-endpoint"
Revert "Merge pull request #899 from gds/feedback-dont-intercept-503-for-report-a-problem-endpoint"

This reverts commit 48d87fc8ff66042a746906b96002d562fdb0ab81, reversing
changes made to d8e47abb26d2c2bbfef5797666792cb44f1b2b11.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet