Added aria-requried attribute to JFormField
Revert "Added aria-requried attribute to JFormField"

This reverts commit 642e7acad792ccc4f103832e6f89752a7dcc41f7.
Added aria-required and required attributes to JFormFieldX classes
Fixed unit tests according to the new output and deleted unnecessary empty lines
Merge pull request #1764 from joomla-accessibility/master

Accessibility: add aria-required attribute to JFormField