cfinput disabled argument is incorrect

[Joshua Haas]

Currently cfinput shows disabled as a boolean. However, that's not actually the behavior. Both of these result in a disabled input field:

<cfinput name="foo" disabled=true>
<cfinput name="foo" disabled=false>

This is because ColdFusion treats this attribute the same as HTML does; its presence at all activates its effect:
https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-tags/tags-i/cfinput.html

So while you technically can pass true or false, both values exhibit the same behavior, disabling the field. The only way to keep the field enabled is to exclude the attribute entirely:

<cfinput name="foo">

I wanted to PR this, but at a glance it looks like this isn't handled in the schema, so hoped someone could chime in on the correct approach here.

Tested on CF 2018.