cosmic-edit: remove obsolete libXrandr input

libXrandr has not been required since winit 0.30.0[1]
(cosmic-edit 1.0.0-alpha.3).

Tested that it still starts on X11.

[1]: https://github.com/rust-windowing/winit/commit/bb9b629bc34c6db8fa1ebda24a03ce0ddbc1d51e

pkgs/by-name/co/cosmic-edit/package.nix

@@ -97,7 +97,7 @@ rustPlatform.buildRustPackage rec {
     wrapProgram "$out/bin/cosmic-edit" \
       --suffix XDG_DATA_DIRS : "${cosmic-icons}/share" \
       --prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [
-        xorg.libX11 xorg.libXcursor xorg.libXi xorg.libXrandr vulkan-loader libxkbcommon wayland
+        xorg.libX11 xorg.libXcursor xorg.libXi vulkan-loader libxkbcommon wayland
       ]}
   '';