Adjust default port

[kilpatty]

From my understanding, standard Electrum servers run on port 8081 for http, and 8082 for https.

This will be a slight change due to the fact that we already run on port 8080, but I think it would be a change in the right direction if we want to make Nomenclate as compatible as Electrum.

There is also a case to be made that since we assume some people might run both instances at the same time, we should run at port 8083, and 8084. Either way, a switch from 8080 is likely required.