Define "any" step value for "number" fields

[dtrucs]

The integer fields have a step attribute set to 1.
But number fields have no step attribute set, so in the case where the form is submitted with <input name="foo" type="number" required /> with a decimal value, html validation prevents submission.

One solution is to define a noValidate attribute for the form tag, but we lose the ultimate validation of the form.
Another solution is to define a step="any" for numbers fields.

Ref https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/number#step

[bhch]

Hello thanks for the PR. I've merged it.