Cannot open macOS VM - limit exceeded

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**Describe the issue**

I have searched the previous issues and found nothing about the VM limits for running macOS on UTM. As I understand there is a hard limit imposed by Apple to not allow more than 2 macOS VMs to run.

The issue I face is that when I shutdown my VM via the VM system, and UTM lists the VM as offline, I can still not re-launch it.

I receive the error:

```
Error
The number of virtual machines exceeds the limit. The maximum supported number of active virtual machines has been reached.
```

I have no other VMs running, I have quit the UTM app, and even checked Activity Monitor. The only way to reset the "count" is a system reboot.

I haven't been able to find anything on fixing this, or if there is an issue at the moment with the way shutting down doesnt minus a count number.

**Configuration**
* UTM Version: 4.3.5(87)
* macOS Version: 13.4.1 (c)
* Mac Chip (Intel, M1, ...): MacBook Pro M2 Max