App appends `:5000` to the name of a socket file.

When I try to run my app over a UNIX socket it seems that Quart appends a bogus port number to the socket name. For example:

```
quart run --host=unix:///$(pwd)/fun.sock
``` 

Results in the file `fun.sock:5000`. Running the exact same app in Flask results in the correct filename, which should be `fun.sock`. 

Environment:

- Python version: 3.12
- Quart version: 0.20.0
