This update for ghostwriter fixes the following issues:

New upstream release, update to version 2.1.6.

For list of fixes see:

- https://github.com/KDE/ghostwriter/releases/tag/2.1.6.
- https://github.com/wereturtle/ghostwriter/releases/tag/2.1.4.
- https://github.com/wereturtle/ghostwriter/releases/tag/2.1.3.
- https://github.com/wereturtle/ghostwriter/releases/tag/2.1.2.
- https://github.com/wereturtle/ghostwriter/releases/tag/2.1.1.