createConfiguration adds a colon to the servers hostname

[kraenhansen]

Goals

A more predictable behaviour from the createConfiguration method.

Expected Results

I would expect the URL to not contain a : if no port was provided in the URL used for authentication.

Actual Results

When calling createConfiguration on a User that was authenticated against a server without a port (such as https://whatever.cloud.realm.io in this example) a colon (:) is appended to the hostname of the sync.url:

url: 'realms://whatever.cloud.realm.io:/default',
                                     ☝️😕

Steps to Reproduce

1. Authenticate a user against a server with the default HTTPs port not specified.
2. Call user.createConfiguration() and log the result.

Version of Realm and Tooling

• Realm JS SDK Version: 2.14.2
• Node or React Native: Node
• Client OS & Version: N/A
• Which debugger for React Native: N/A