Set form name for HTMLForms in FormAction subclasses.

Set form name for HTMLForms in FormAction subclasses.

Used FormAction::getName() to set the form name for
FormAction subclasses. Without a form name, HTMLForm
creates weird messages names for certain fields (e.g.,
in a form with sections, HTMLForm will use the message
"$prefix-$key" for the legend, but if no prefix exists,
it just becomes "-$key").

Change-Id: I1c19775e44163f4335e30f1d1f73a6e002cb57ec
Signed-off-by: Tyler Anthony Romeo <tylerromeo@gmail.com>