Delete the H44.NotFormControl case

The H44 test procedure (http://www.w3.org/TR/WCAG20-TECHS/H44) tells to verify each input, select and textarea elements, to check :
- if there is a label before the element
- if the for attribute of THIS label identify the element,
- this label must be visible

There is no rule checking that all labels must have a for attribute identifying an input element.
That's why the sniffer should not check the H44.NotFormControl