fix(connect): path is lost when using servers

[Mika56]

When using servers option, path is not copied from server. However, this path may be needed for ws (and wss)

const client = mqtt.connect({
    servers: [
        {"host":"192.168.30.1", "protocol": "mqtt", "port": 1883},
        {"host":"192.168.30.1", "protocol": "ws", "port": 8084, "path": "/mqtt"}
    ],
});

Say client is unable to connect using mqtt:// and tries to fallback using ws://, then path will always be set to /. With this patch, path is copied from server to client options.

[robertsLando]

@Mika56 thanks for your PR! Could you add a unit test that covers this please?