nixos/xfce: Fix ambiguous with

Pull request 345352 introduces `pkgs.exo`, don't pick up that package.

nixos/modules/services/x11/desktop-managers/xfce.nix

@@ -80,7 +80,7 @@ in
   };
 
   config = mkIf cfg.enable {
-    environment.systemPackages = utils.removePackagesByName (with pkgs.xfce // pkgs; [
+    environment.systemPackages = utils.removePackagesByName (with pkgs; [
       glib # for gsettings
       gtk3.out # gtk-update-icon-cache
 
@@ -88,7 +88,7 @@ in
       adwaita-icon-theme
       hicolor-icon-theme
       tango-icon-theme
-      xfce4-icon-theme
+      xfce.xfce4-icon-theme
 
       desktop-file-utils
       shared-mime-info # for update-mime-database
@@ -99,37 +99,37 @@ in
       # Needed by Xfce's xinitrc script
       xdg-user-dirs # Update user dirs as described in https://freedesktop.org/wiki/Software/xdg-user-dirs/
 
-      exo
-      garcon
-      libxfce4ui
+      xfce.exo
+      xfce.garcon
+      xfce.libxfce4ui
 
-      mousepad
-      parole
-      ristretto
-      xfce4-appfinder
-      xfce4-notifyd
-      xfce4-screenshooter
-      xfce4-session
-      xfce4-settings
-      xfce4-taskmanager
-      xfce4-terminal
+      xfce.mousepad
+      xfce.parole
+      xfce.ristretto
+      xfce.xfce4-appfinder
+      xfce.xfce4-notifyd
+      xfce.xfce4-screenshooter
+      xfce.xfce4-session
+      xfce.xfce4-settings
+      xfce.xfce4-taskmanager
+      xfce.xfce4-terminal
     ] # TODO: NetworkManager doesn't belong here
       ++ optional config.networking.networkmanager.enable networkmanagerapplet
-      ++ optional config.powerManagement.enable xfce4-power-manager
+      ++ optional config.powerManagement.enable xfce.xfce4-power-manager
       ++ optionals (config.hardware.pulseaudio.enable || config.services.pipewire.pulse.enable) [
         pavucontrol
         # volume up/down keys support:
         # xfce4-pulseaudio-plugin includes all the functionalities of xfce4-volumed-pulse
         # but can only be used with xfce4-panel, so for no-desktop usage we still include
         # xfce4-volumed-pulse
-        (if cfg.noDesktop then xfce4-volumed-pulse else xfce4-pulseaudio-plugin)
+        (if cfg.noDesktop then xfce.xfce4-volumed-pulse else xfce.xfce4-pulseaudio-plugin)
       ] ++ optionals cfg.enableXfwm [
-        xfwm4
-        xfwm4-themes
+        xfce.xfwm4
+        xfce.xfwm4-themes
       ] ++ optionals (!cfg.noDesktop) [
-        xfce4-panel
-        xfdesktop
-      ] ++ optional cfg.enableScreensaver xfce4-screensaver) excludePackages;
+        xfce.xfce4-panel
+        xfce.xfdesktop
+      ] ++ optional cfg.enableScreensaver xfce.xfce4-screensaver) excludePackages;
 
     programs.gnupg.agent.pinentryPackage = mkDefault pkgs.pinentry-gtk2;
     programs.xfconf.enable = true;