refactor: limit attribute rules to input element

[meiraleal]

Currently the rules for styling the inputs are too broad and may conflict with web components that use props named type or mutiple. This PR address this issue by using :where to select only inputs without change the specificity.

[Julien-R44]

Thanks

Since unocss-preset-forms is a dumb port of the tailwind library, let's wait until tailwindlabs/tailwindcss-forms#159 is merged before making the same changes