Don't show form inputs with display:none

When the current element or a parent has display:none, the display_none
flag is set and no new element should be added to the viewport. For form
inputs, instead of always adding the Embed to the viewport, we only do
it if display_none is not set. The Embed is still registered as an input
in the form, so it will continue to send the proper form values to the
server.

For complex buttons that can contain nested elements inside, we switch
to a dummy button that doesn't have a Textbox and rely on the logic at
html.cc to avoid creating more child elements until the display_none is
unset.

Fixes: https://github.com/dillo-browser/dillo/issues/433

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