In a local installation, ewoksweb cannot connect to `ewoks-server` if the port was changed.

Tested with 0.5.0rc0

By running ewoks-server -p 5173 (any other port number than 5000), we get asked to open http://127.0.0.1:5173 to open ewoksweb. While the page displays, we get Network error since it tries to request http://localhost:5000 instead of http://localhost:5173.