be consistent about ./test dir, since spago generates project with ./test/Test/Foo.purs

[srghma]

…

Description of the change

TODO

Checklist:

• [ ] Added the change to the "Unreleased" section of the changelog
• [ ] Added some example of the new feature to the README
• [ ] Added a test for the contribution (if applicable)

P.S.: the above checks are not compulsory to get a change merged, so you may skip them. However, taking care of them will result in less work for the maintainers and will be much appreciated 😊