Update pdfpc to 4.3.0
Changelog:
- Backward incompatible changes
- Improvement/more logical default key bindings
- GTK+3 >= 3.22
- Four-State operation mode
- Makes handling of drawing, eraser and pointer mode much easier
- Permament setting of pointer color and size in pdfpcrc
- Window placement can be done by monitor name
- Subtitles for video playback
- Different slide sizes per presentation are allowed
- Bug fixes
- Wayland high DPI scaling issues
- Window placement issues with some WMs