fix: provide default port when adding custom network

[dated]

Summary

Adding a custom network fails if the seed server has no port. This PR provides default values if the port is missing.

Regarding the changes made to:

__parseCurrentPeer () {
    const matches = /(https?:\/\/)([a-zA-Z0-9.-_]+):([0-9]+)/.exec(this.host)
    const scheme = matches[1]
    const ip = matches[2]
    const isHttps = scheme === 'https://'
    let port = isHttps ? 443 : 80
    if (matches[3]) {
      port = matches[3]
    }

    return {
      ip,
      port,
      isHttps
    }

If this.host contains no port, matches is null and const scheme = matches[1] throws a type error. Checking against matches[3] afterwards is useless at this point.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

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