Issue Type: Bug
When I try to use ${relativeFile} and ${relativeFileDirname} in multi-root workspace launch configurations (or ${relativeFile:name} and ${relativeFileDirname:name}), they resolve to absolute paths.
VS Code version: Code 1.44.1 (a9f8623, 2020-04-11T01:47:00.296Z)
OS version: Darwin x64 19.4.0