Update plasma5-workspace to version 5.20.0 / rev 147 via SR 841562
https://build.opensuse.org/request/show/841562
by user Vogtinator + dimstar_suse
- Add patch to fix startup of some applications (mostly Tk):
* 0001-Revert-krdb-Call-xrdb-with-nocpp-to-fix-gitk-runtime.patch