Revert "gnome.gnome-boxes: add qemu to path"

Boxes insert the absolute path of `qemu-system-x86_64` program
as found on `PATH` into the `<emulator>` element of the libvirt
config. But if we add qemu to `PATH` using a wrapper, the saved
path will point directly to a store path, which will break when
the store path is garbage collected.

Let’s drop it again so that qemu can be picked up from the environment
using a more stable path such as `/run/libvirt/nix-emulators/qemu-system-x86_64`
introduced by the `virtualisation.libvirtd.enable = true;` NixOS option.

This reverts commit ba1ecbea398cd28341c422f3a15e09a54fecfbd9,
essentially re-applying 120337053f4d28b34dab9a07efa1cd2d85c6e869.

Fixes: https://github.com/NixOS/nixpkgs/issues/57931

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