Powering off Linux VM doesn't release virtio filesystem.

**Describe the issue**
Powering down my Linux VM doesn't seem to release the virtio file share, so UTM won't let me restart it.

**Configuration**
* UTM Version: 4.3.5
* macOS Version: 13.2.1

* Mac Chip (Intel, M1, ...): M2

Using an Ubuntu ARM64 aarch64 Qemu VM.

From within the VM, I choose power down - when I go to start again, I get:
```
QEMU error: QEMU exited from an error: qemu-aarch64-softmmu: -device virtio-9p-pci,fsdev=virtfs0,mount_tag=share: cannot initialize fsdev 'virtfs0': failed to open '/Users/stuartaxon/projects': Operation not permitted
```
Directory Share mode is VirtFS.

If I quit UTM then restart it, everything is fine.