Wayvnc almost always picks raw encoding

### Useful information: When running wayvnc with `--log-level=debug` it nearly always says `Info: Choosing raw encoding for client 0xXXXX...`. Only ZRLE and Tight seem to work, everything else (copyrect, open-h264) will result in the use of raw encoding. - **Version:** - wayvnc: 0.9.1 - also tried git version - Context: - Command line arguments: `wayvnc -pdL=debug -o DP-2 ::1` - Wayland comp.: sway version 1.11 - Clients: Remmina and wlvncc - Operating system: Gentoo - Kernel version: 6.15.9 - Graphics drivers: mesa-25.1.7 [wayvnc.log](https://github.com/user-attachments/files/21904230/wayvnc.log)