nixos/modules/programs/spacefm: remove gksu dependency

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -737,6 +737,14 @@
           0042</link> configuration.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The default value for
+          <literal>programs.spacefm.settings.graphical_su</literal> got
+          unset. It previously pointed to <literal>gksu</literal> which
+          has been removed.
+        </para>
+      </listitem>
       <listitem>
         <para>
           A new module was added for the

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -247,6 +247,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The `services.mbpfan` module was converted to a [RFC 0042](https://github.com/NixOS/rfcs/blob/master/rfcs/0042-config-option.md) configuration.
 
+- The default value for `programs.spacefm.settings.graphical_su` got unset. It previously pointed to `gksu` which has been removed.
+
 - A new module was added for the [Starship](https://starship.rs/) shell prompt,
   providing the options `programs.starship.enable` and `programs.starship.settings`.
 

nixos/modules/programs/spacefm.nix

@@ -27,13 +27,11 @@ in
         default = {
           tmp_dir = "/tmp";
           terminal_su = "${pkgs.sudo}/bin/sudo";
-          graphical_su = "${pkgs.gksu}/bin/gksu";
         };
         defaultText = literalExpression ''
           {
             tmp_dir = "/tmp";
             terminal_su = "''${pkgs.sudo}/bin/sudo";
-            graphical_su = "''${pkgs.gksu}/bin/gksu";
           }
         '';
         description = ''