Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

…vue core

After all, `vuejs/core` is more of a TypeScript project than a Vue project.
I feel that we really need `printWidth: 100` for templates.

And `arrowParens` isn't that important. Let's use the default value.
Moreover, as stated in [prettier's documentation](https://prettier.io/docs/en/options#arrow-function-parentheses),
`arrowParens: "always"` is better for adding type annotations, extra
arguments or default values as well as making other changes.
I believe that `arrowParens: "avoid"` is set in `vuejs/core` only
because it started using prettier in its 1.x era and want to avoid
too drastic style changes. vuejs/core#3926 (comment)

…defaults

Also fixes the regression introduced in 1d657db
that the standard prettier config omits `"trailingComma": "none"` and
got an extraneous printWidth option.