Previously `writeDarwinBundle` used a handcrafted shell wrapper, however
this causes issues on Apple Silicon Macs as script-only application
bundles are always run under Rosetta[0][1].

Replacing the handcrafted shell wrapper with a binary wrapper allows
apps to run natively instead of requiring Rosetta. However, this means
we can no longer use `$1` and `$@`.

After checking nearly every current usage of `desktopToDarwinBundle`,
there were no apps that used `%[fFuU]` before the last argument, meaning
removing them naively is good enough for the current apps.

[0]: https://developer.apple.com/documentation/apple-silicon/building-a-universal-macos-binary
[1]: https://stackoverflow.com/a/68208374