this is only shown if the TOS haven't been accepted yet!
for now this only opens the browser, similar to the Flow2Auth page
the `TermsOfServiceCheckWidget` is a combination of the `Flow2Auth` and
the `Flow2AuthWidget` classes -- in the future we ideally display the
required TOS directly in the wizard
Signed-off-by: Jyrki Gadinger <nilsding@nilsding.org>
