The decompiler/pretty-printer outputs strange types for functions sometimes

As an example:

This is from here: https://github.com/tezos-commons/baseDAO/blob/70e2eb1a0e6dbb3d12e4abffc8e52380bd7c71c5/src/base_DAO.mligo#L35

Acceptance criteria

The decompiler/pretty printers are fixed to not output such strange types.