Try finding xorg clipboard utils before wayland ones

[Baitinq]

If you have both Wayland and XOrg installed on your system and are currently using XOrg, tmux-yank would use wl-copy, which doesnt work on XOrg.

Now, we use the XOrg utilities first, which should work even if you're using Wayland thanks to XWayland.

[LasseWolter]

I think #131 might be a slightly cleaner solution. Either way, merging any of these fixes would be great!