Update Breeze color scheme's colors

Summary:
When I updated the colors of the systemwide Breeze color scheme last
year, I neglected to update the Konsole color scheme. This patch corrects
that oversight.

Colors taken from https://hig.kde.org/style/color/default.html

CCBUG: 391920

Test Plan:
Overall, the contrast is much better than it was before.

Reviewers: Konsole, hindenburg

Reviewed By: Konsole, hindenburg

Subscribers: hindenburg, konsole-devel

Tags: Konsole

Differential Revision: https://phabricator.kde.org/D17613