Merge pull request #122602 from primeos/sway-set-xdg-env-vars

sway: Set XDG_CURRENT_DESKTOP=sway

pkgs/applications/window-managers/sway/wrapper.nix

···
   baseWrapper = writeShellScriptBin "sway" ''
      set -o errexit
      if [ ! "$_SWAY_WRAPPER_ALREADY_EXECUTED" ]; then
+       export XDG_CURRENT_DESKTOP=sway
        ${extraSessionCommands}
        export _SWAY_WRAPPER_ALREADY_EXECUTED=1
      fi