Re-add missing colors 01, 02, 04, 06, 09, and 0F to Gnome Terminal Dark template

This is intended to resolve issue https://github.com/chriskempson/base16-builder/issues/179 for Gnome Terminal Dark. It re-adds missing colors 01, 02, 04, 06, 09, and 0F, which were removed (perhaps inadvertently) in a previous commit (307572).

Please note I have not submitted a fix for Gnome Terminal Light because I don't use/test that scheme, but I suspect almost identical fix should apply.