[BUGFIX] EXT:form - fix radio button html markup

Make the radio button html markup closer to
http://getbootstrap.com/css/#checkboxes-and-radios

- remove the "for" attribute from the container label tag
- add the "radio" class to the elements div wrapper
- remove the class attribute from the elements label tag

Resolves: #81715
Releases: master
Change-Id: Ic4be5b51f38fb2313e230bfaf0f85ec7fe8431c9
Reviewed-on: https://review.typo3.org/53364


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>