Bad error message when firmware for "aarch64" not found.

[msgilligan]

Description

I'm trying to run Lima on a GitHub ubuntu-24.04-arm runner and getting the following error message:

could not find firmware for \"aarch64\" (hint: try copying the \"edk-/usr/bin/qemu-system-aarch64-code.fd\" firmware to $HOME/.local/share/qemu/)

In qemu.go the source code is:

  return "", fmt.Errorf("could not find firmware for %q (hint: try copying the \"edk-%s-code.fd\" firmware to $HOME/.local/share/qemu/)", arch, qemuExe)

The variable qemuExe seems to have the full path to the executable (/usr/bin/qemu-system-aarch64), but for the error message to be correct only aarch64 should be inserted to get the correct filename of edk-aarch64-code.fd.