fix(openwork): use renamed com.differentai.openwork.desktop from AppImage

Upstream renamed the desktop file from openwork.desktop to
com.differentai.openwork.desktop (reverse-DNS), causing the build to
fail with "cannot stat '.../openwork.desktop'". Source the new name
while keeping the install destination as openwork.desktop so icon and
Exec substitution stay unchanged.

pkgs/openwork/default.nix

@@ -25,7 +25,7 @@ in
     inherit pname version src;
 
     extraInstallCommands = ''
-      install -m 444 -D ${appimageContents}/openwork.desktop \
+      install -m 444 -D ${appimageContents}/com.differentai.openwork.desktop \
         $out/share/applications/openwork.desktop
       substituteInPlace $out/share/applications/openwork.desktop \
         --replace-fail 'Exec=AppRun %U' 'Exec=${pname} %U'