fix(loop): keep only --ozone-platform=x11, remove --no-sandbox

User confirmed that --no-sandbox is unnecessary and that the app
crashes without --ozone-platform=x11. Keep the minimal working
wrapper flags.

packages/loop/package.nix

@@ -131,7 +131,7 @@ EOF
     wrapProgram $out/bin/loop \
       --prefix PATH : ${glib.bin}/bin \
       --prefix LD_LIBRARY_PATH : $out/share/loop \
-      --add-flags "--no-sandbox"
+      --add-flags "--ozone-platform=x11"
   '';
 
   passthru = {