[Bug 1871644]

[B-emilio]

So, querying the individual border-radius properties doesn't work. I
get:

> (firefox:17330): Gtk-WARNING **: 00:39:54.651: Style property "border-
top-left-radius" is not gettable

And same for the other corners of course. However, my patch works,
because of [this
code](https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-20/gtk/gtkcssshorthandpropertyimpl.c#L961-977).
Basically, querying `border-radius` on gtk3 returns the `border-top-
left-radius`, which happens to work for us, yay :)

So given there's no way to access the other border corners, and that
this works for our purposes, I think we should probably just roll with
it, thoughts?

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https://bugs.launchpad.net/bugs/1871644

Title:
  Top corners of Firefox windows have weird black protrusions from the
  rounded edges

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