alacritty: remove obsolete libXrandr input

libXrandr has not been required since winit 0.30.0[1]
(alacritty 0.14.0).

Tested that it still starts on X11.

[1]: rust-windowing/winit@bb9b629

Author: alyssais

pkgs/by-name/al/alacritty/package.nix

@@ -33,7 +33,6 @@ let
     xorg.libX11
     xorg.libXcursor
     xorg.libXi
-    xorg.libXrandr
     xorg.libXxf86vm
     xorg.libxcb
     libxkbcommon