xdg-terminal-exec: remove upstreamed patched

hosts/common/programs/xdg-terminal-exec.nix

@@ -2,13 +2,6 @@
 {
   sane.programs.xdg-terminal-exec = {
     packageUnwrapped = pkgs.xdg-terminal-exec.overrideAttrs (upstream: {
-      # fix for <https://github.com/Vladimir-csp/xdg-terminal-exec/issues/50>
-      postPatch = (upstream.postPatch or "") + ''
-        sed '2i\
-        unset TERMINAL\
-        ' -i xdg-terminal-exec
-      '';
-
       # give the package a .desktop item.
       # this way anyone can launch a terminal via the xdg-desktop-portal.
       nativeBuildInputs = (upstream.nativeBuildInputs or []) ++ [