Fix cli add "version" into dynamic array even already included

[waketzheng]

How to reproduce

• My pyproject.toml

[project]
name = "asynctor"
description = ""
authors = []
readme = "README.md"
license = { text = "MIT" }
requires-python = ">=3.9"
dynamic = [ "version" ]
dependencies = []

[tool.poetry]
version = "0.0.1"

[build-system]
requires = ["poetry-core>=2.0"]
build-backend = "poetry.core.masonry.api"

• After running poetry dynamic-versioning enable, the dynamic array of project section was changed to be:

dynamic = [ "version", "version" ]

[mtkennerly]

Thanks!