Global pkl-gen-go fails to properly use relative project dir

[eli-l]

Simple project structure that is evaluated well with pkl eval

But is failing to evaluate when global pkl-gen-go is used. (go install github.com/apple/pkl-go/cmd/pkl-gen-go@latest)

The problem could not be replicated in the cloned pkl-go repo, because generator-settings.pkl is present in the root, and project dir is built correctly (https://github.com/apple/pkl-go/blob/main/cmd/pkl-gen-go/pkl-gen-go.go#L107)

If the file in the repo is not present, settings.Uri is falling back to codegen/src/GeneratorSettings.pkl and relative settings.ProjectDir (which can be set with the flag) is not joined correctly.

Expected behaviour:
Project dir should rely on current working dir, rather than on settings file, that might be falling back to global pkg set that makes --project-dir relative paths obsolete.