[Lazarus] Sparta Form Designer patch

[Anthony Walter]

Maceij,

I put together a patch for the sparta docked form designer and attached it
to this issue:

https://bugs.freepascal.org/view.php?id=32194

This fixes the designer on gtk2, and probably qt as well. I made a few
small changes, some of which are hacks, notably the fix for BorderStyle. I
also removed the green color, which I assume was for testing.

The real big issue left I can see is BorderIcons always resetting to [] on
non windows platforms.
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