fix BadMatch error when embedding on some windowsHEADmaster

When embedded, st fails with BadMatch error if the embedder's window has
non-default colormap/depth/visual.  This commit fixes that by creating
st's window inside root and then reparent it into embedder.

The reference window for dc.gc is also changed to match root's visuals.

A similar commit had been made for dmenu[1].
See this issue[2] on github for context.

[1]: https://git.suckless.org/dmenu/commit/0fe460dbd469a1d5b6a7140d0e1801935e4a923b.html
[2]: https://github.com/phillbush/xfiles/issues/47

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