lately the highlight color of plasma became a very
washed-out blue, (since it switched to use the
global system colors) that was because it actually
taken the highlight color (and highlightedText)
from the wrong source.
there is a correct color group in kcolorscheme for
that, that is Selection, take those two colors
from that (also means highlight and highlightedtext
always be the same in all plasma::theme::colorgroups
but that's not a problem)
update test to reflect that
REVIEW:127842
f0c119696d