Fix label for facets checkboxes

Had "for" attribute *and* wrapped the checkbox, this caused the label
to not tick the checkbox when clicked.

Found in chromium Version 29.0.1547.57 Debian jessie/sid (217859)
Correct indentation of facet checkbox's label

To make the use of wrapping more obvious.
Merge pull request #65 from alphagov/facet-label-fix

Facet label fix