Link decoration doesn't work with single word domain names

Description:

When you post a link like https://google.com/something Rocket.Chat decorates it as a link and make it clickable.
But when you have some local network service with single-word-domain-name and link looks like http://server/documents it doesn't work as expected.

Also suggested method to add in the Workspace > Setting > Message Custom Domain Whitelist for Auto Link Setting DOES NOT WORK for a single word domain name.
f.e. http://server/documents will not be decorated even I write "server" into Workspace > Setting > Message

I know about [](link) decoration, but if you use it a hundreds of times every day it sucks.

Steps to reproduce:

1. Open any chat
2. Post a link like "http://server/documents"
3. It isn't decorated and isn't clickable

Expected behavior:

Link decorated as a hyperlink and open browser when is clicked

Actual behavior:

Link looks like simple text

Server Setup Information:

• Version of Rocket.Chat Server: 6.2.10
• Operating System: ubuntu 18
• Number of Running Instances: 1

Client Setup Information

• Desktop App or Browser Version: 3.9.4
• Operating System: windows 10

Start at Workspace > Settings > Message > Custom Domain Whitelist for Auto Link and reproduce the issue with http://server/documents. Trace the message link-decoration path and its handling of single-word domains and whitelist entries. Done means such links become clickable while ordinary text remains unchanged, with coverage for the reported case.