Fix #9812: CoqIDE on gtk3 has wrong defaults for selection BG.

Unfortunately, the only sane fix I was able to hack was to deactivate
the possibility to change the background colour altogether. Trying to
do otherwise is a real Pandora's box which is ultimately triggered by
the lack of lablgtk3 bindings for the GtkStyleContext class.

I tried a lot of alternative approaches, to no avail. This includes
catching the selection signal, reimplementing selection by hand in
GtkTextView, and even reading the internal details of the GTK
implementation turned not that helpful.

For the time being (8.10 beta) I think we do not have much choice.

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