Fix: Package resolution from Docker containers

Motivation and Context

When using LIGO via docker docker run --rm -v "$PWD":/project -w /project ligolang/ligo:0.54.0 compile contract contracts/main.mligo

If the $PWD is attached to a different directory inside the container LIGO is not able to find packages.

Description

The package path resolution (ModRes) was dependent on the path to the project-root in the host system.

This MR removes the dependency of such a path, allowing LIGO to find packages inside Docker containers.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Performance improvement (non-breaking change that improves performance)
• None (change with no changelog)

Changelog

Fixes package resolution for LIGO when used via Docker container.

Checklist:

• Changes follow the existing coding style (use dune @fmt to check).
• Tests for the changes have been added (for bug fixes / feature).
• Documentation has been updated.
• Changelog description has been added (if appropriate).
• Examples in changed behaviour have been added to the changelog (for breaking change / feature).