Not all available networks are displayed on various form pages

[ElliotFriend]

Playing with the API sandbox, the networks listed don't always contain all the available testnet networks. Specifically, I found the following pages are missing quite a few networks that are listed in the /lib/chains.json file.

• /debug/beta/addressBook/create
• /debug/beta/addressBook/create/fetch

I'm building on Stellar, so I tested locally including the Stellar/XLM chain on those pages, and things seem like they worked fine. There may be more pages that are missing some networks.