Support xsel

I keep getting the following error message when I try to use the clipboard: "Couldn't find the required `xsel` binary. On Debian/Ubuntu you can install it with; sudo apt install xsel". I do have xsel installed, so I think this might be a flatpak issue?

I am running VSCode purely in wayland using ozone, in case that might have anything to do with it.

Let me know if I can do anything to help solve the issue, or if any more information is needed.