Registration: Custom node reg always falls back on localhost:4000

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Steps to reproduce

1. Run lisk core not on the 4000 port
2. Choose Custom Node
3. Enter Url on which you are running core
4. Walk through the registration process

Actual result

Error popup: Unable to connect to node
Hub tries to connect to localhost:4000

Expected result

Appear logged in devnet on specified port

Version

1.3, 1.4

Screenshot (if appropriate)

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Specification

• Custom node URL should be validated (try to connect to it) on login page when clicking "Create Lisk ID"
• If the request is successful, then set the node and go to the first step of creating a new account
• If the request fails, then show "Unable to connect the node" error toast and stay on the login page
• If network is not custom node, then clicking "Create Lisk ID" doesn't check the mainnet/testnet URL, sets the node, and goes directly to the first step of creating a new account