Fixing "Deploy to iTunes Connect / TestFlight (with Deliver)" step

Changelog
1

Related issue report: https://github.com/bitrise-io/build.issues/issues/43

2

Fix PR: https://github.com/bitrise-io/steps-deploy-to-itunesconnect-deliver/pull/20

3

Fixed in v2.8.0 of the Step and shared into the Bitrise StepLib