[#527] Fix generics derivation for unordered sum types
Problem: it is said that if constructors are not sorted alphabetically,
ligoLayout produces invalid code.
Solution: apparently I made a dumb bug when implemented this, applying sorting twice; with this commit this is not the case anymore.
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- If I added new functionality, I added tests covering it.
- If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.