Fix only expecting 1 backend node on Integration
Fix only expecting 1 backend node on Integration

This was mistakenly changed without realising Integration is actually
broken - we're missing 1 backend node, out of 2.

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