Test customization ignored for expected files

[fsteimke]

Release 2.2.1 contains a test customization for a particular test case (book.014.xml).

It is used as intended when running ./gradlew book.014.html. But seems to be ignored when producing the expected result file with ./gradlew book.104.expected. So that the contents of produced files (build/actual/book.014.html vs test/resources/expected/book.014.html) differ.

Discovered while working on the pull request for landscape support.