bugfix: avoid usage of removed package:get_package_path()

[sivaplaysmC]

This change fixes error on csharp nvim lsp startup, by using the old $MASON environment variable.

Please merge this ASAP - the removed api is causing startup errors.

https://github.com/mason-org/mason.nvim/discussions/33#discussioncomment-13095400

@ Alan-John-Byrne

Sadly this no longer works. The get_install_path method was completely removed.

I had the same problem, there is a changelog note: https://github.com/mason-org/mason.nvim/blob/7c7318e8bae7e3536ef6b9e86b9e38e74f2e125e/CHANGELOG.md?plain=1#L65

I'm using vim.fn.expand "$MASON/packages/codelldb" for example.

Thanks for the heads up 👍