aria-invalid attributes to have a valid 'true' value (#3639)
This PR fixes an issue with the `aria-invalid` attributes on some form
elements.
In theory this shouldn't matter and behaves the same as other
attributes. MDN also mentions that any other value than the known set of
values will be treated as `true`.
However, some tools, including the Accessibility tab in Google Chrome
will complain because we set it to `aria-invalid=""`.
We already used `'true'` for `aria-checked` as well, so this change
makes it more consistent.
It will also make sure that `aria-invalid:flex` in Tailwind CSS works as
expected because this compiles to:
```css
.aria-invalid\:flex {
&[aria-invalid="true"] {
display: flex;
}
}
```
Which means that the current implementation didn't work in this case
either.
Fixes: #3623
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