use new error blade directive

[dakira]

Laravel 5.8.13 introduced a new blade directive that cleans up the error handling. It's used in the laravel/ui blade templates, so it would be nice if the tailwind-presets used it, too.

[edgrosvenor]

This is kind of a high priority pull request, I think, because the existing templates result in errors being thrown in Laravel 6.x. I don't remember seeing any documentation about a breaking change around the old $error->has() stuff, but the $error object appears to be missing. I solved it on my own site by manually changing to the new directive much like this pull request does.