refactor: AA-692: Update location of is-hidden class when fa icon is used
refactor: AA-692: Update location of is-hidden class when fa icon is used

We ran into a bug where the is-hidden class was being overridden by the
font awesome styling due to a late load of font awesome (causing the
fa class to take precedence). This changes to instead wrap the icon in
the span so there is no competing between the two classes on the same
element

angelapper/edx-platform,arbrandes/edx-platform,arbrandes/edx-platform,angelapper/edx-platform,edx/edx-platform,eduNEXT/edx-platform,eduNEXT/edunext-platform,edx/edx-platform,eduNEXT/edunext-platform,eduNEXT/edx-platform,angelapper/edx-platform,angelapper/edx-platform,EDUlib/edx-platform,edx/edx-platform,EDUlib/edx-platform,eduNEXT/edunext-platform,EDUlib/edx-platform,arbrandes/edx-platform,eduNEXT/edx-platform,edx/edx-platform,eduNEXT/edx-platform,EDUlib/edx-platform,arbrandes/edx-platform,eduNEXT/edunext-platform