Update grml-zsh-config to version 0.19.7 / rev 4 via SR 1148544
https://build.opensuse.org/request/show/1148544
by user jubalh + anag+factory
- Update to 0.19.7:
* etc/skel/.zshrc: set file encoding to UTF8.
* zshrc: bugfix for _complete_screen_display when using tmux
* Bump Standards-Version to 4.6.2