fix BadMatch error when embedding on some windowsHEADmaster

When embedded into another window, dmenu will fail with the BadMatch
error if that window have not the same colormap/depth/visual as the
root window.

That happens because dmenu inherits the colormap/depth/visual from
its parent, but draws on a pixmap created based on the root window
using a GC created for the root window (see drw.c).  A BadMatch will
occur when copying the content of the pixmap into dmenu's window.

A solution is to create dmenu's window inside root and then reparent
it if embeded.

See this mail[1] on ports@openbsd.org mailing list for context.

[1]: https://marc.info/?l=openbsd-ports&m=168072150814664&w=2

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