D5741: Fix test when compiling from a tarball

[Aleix Pol Gonzalez]

apol created this revision.
Restricted Application added projects: Frameworks, Build System.
Restricted Application added a subscriber: Build System.

REVISION SUMMARY
  Otherwise it doesn't work when falling back to the project name.

TEST PLAN
  Ran the test locally with and without .git directory

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5741

AFFECTED FILES
  tests/KDEFetchTranslations/CMakeLists.txt

To: apol, #frameworks, joselema
Cc: #build_system
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