fix msty license persistence

pkgs/msty/default.nix

@@ -1,6 +1,7 @@
 {
   appimageTools,
   fetchurl,
+  makeWrapper,
 }: let
   pname = "msty";
   version = "1.7";
@@ -14,11 +15,15 @@ in
   appimageTools.wrapType2 {
     inherit pname version src;
 
+    nativeBuildInputs = [makeWrapper];
+
     extraInstallCommands = ''
       install -m 444 -D ${appimageContents}/msty.desktop -t $out/share/applications
       substituteInPlace $out/share/applications/msty.desktop \
         --replace 'Exec=AppRun' 'Exec=${pname}'
       install -m 444 -D ${appimageContents}/msty.png \
         $out/share/icons/hicolor/256x256/apps/msty.png
+      wrapProgram $out/bin/${pname} \
+        --set XDG_CURRENT_DESKTOP GNOME
     '';
   }