Fix cookiecutter-module pyproject.toml "prefixes =" key

Lars Wuerfelrequested to merge
topic/default/fix_cookiecutter-module_pyproject_prefixes into branch/default

This fixes a typo with the keyword "prefixes" in the pyproject.toml file of the cookiecutter module template.

Discussion: https://discuss.tryton.org/t/is-there-an-equivalent-for-setup-pys-module2prefix-in-pyproject-toml/9348

Closes #15054 (closed)

Edited by Lars Wuerfel

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