Avoid installing files that collide with kde-plasma/breeze.

Gentoo-bug: 594594
KDE-bug: 368093

--- a/krita/data/themes/CMakeLists.txt
+++ b/krita/data/themes/CMakeLists.txt
@@ -1,8 +1,6 @@
 ########### install files ###############
 
 install(FILES
-BreezeDark.colors
-BreezeHighContrast.colors
 BreezeLight.colors
 KritaNeutral.colors
 KritaBlender.colors