Fix Breeze Light color scheme to match regular Breeze version, where appropriate

Summary:
When I improved the contrast of the Breeze color scheme in D7424, I forgot about
Breeze Light. This patch corrects that, and applies the same changes, where
appropriate.

Test Plan:
Used Breeze light for a while; text, view, and window colors are now the same as
Breeze.

Reviewers: VDG, GB_2, rooty

Reviewed By: rooty

Subscribers: rooty, sefaeyeoglu, plasma-devel

Tags: Plasma

Maniphest Tasks: T10201

Differential Revision: https://phabricator.kde.org/D19091