submodule path should relative to working dir

[jan4984]

for now, it's joined with the ninja file including it.

turtle-build/src/main.rs

Line 178 in 04a2799

async fn resolve_submodule_path(

async fn resolve_submodule_path(
    context: &Context,
    module_path: &Path,
    submodule_path: &str,
) -> Result<(String, PathBuf), ApplicationError> {
    Ok((
        submodule_path.into(),
        context
            .file_system()
            .canonicalize_path(&module_path.parent().unwrap().join(submodule_path))
            .await?,
    ))
}