GTK: improved the RGB values of the 16 default colors

* Using the same values as on Curses/scinterm resulted in too dark colors with
  terminal.tes. (solarized.tes actually defines all colors with its own RGB values,
  so the look has always been consistent between Curses and GTK.)
  This is because the values like 0xFF0000 for red are actually just placeholders in Scinterm,
  in turn translated internally to Curses colors, which are interpreted by terminal emulators
  with possibly various different color palettes.
* We therefore now use the exact RGB values as will be used by common terminal emulators
  like xterm and st.
  It does not guarantee that the colors will always match between Curses and GTK,
  but at least the GTK colors are now a bit brighter.

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