[Bug]: QR code doesnt use correct url

### System architecture

Mac, ARM64 (M1, M2, etc)

### PHP Version

_No response_

### Bug description

From a Herd site, with Expose Free, run `expose --qr`.

You get the `You are not allowed to specify custom subdomains. Please upgrade to Expose Pro. Assigning a random subdomain instead` message which is expected.

However the QR code points to the custom subdomain URL, not the one that actually gets used.

### Steps to reproduce

_No response_

### Relevant log output

```shell

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