Whitespace is not permit for search users on Channel create/modificate

Description:

Whitespace is not permit for search (in field 'name') on create/modificate channel (input "Invite Users")
We use "real_name" feature on 'layout / user interface' so search with white space in field 'name' is imperative for us.

Steps to reproduce:

1. Click to Create new Channel
2. Add new user without a Whitespace character (because Whitespace is not authorized) to Channel in input 'Invite Users'
3. Impossible to find a correct user for large directory because without possibility to use Whitespace result is too large

OR

1. Click to a Channel already exist
2. Click to Members submenu
3. Click to '+ Add users'
4. Add new user without a Whitespace character (because Whitespace is not authorized) to Channel in input 'Invite Users'
5. Impossible to find a correct user for large directory because without possibility to use Whitespace result is too large

Expected behavior:

Permit search with Whitespace in input "Invite Users" for Channel create/modificate

Actual behavior:

Do not permit Whitespace in search input "Invite Users" for Channel create/modificate

Server Setup Information:

• Version of Rocket.Chat Server: 3.8.0
• Operating System: Linux debian buster
• Deployment Method: from source
• Number of Running Instances: 3
• DB Replicaset Oplog: 1
• NodeJS Version: v12.18.4
• MongoDB Version: 4.2.10

Client Setup Information

• Desktop App or Browser Version: Chrome / Firefox / Desktop app
• Operating System: Linux

Additional context

Relevant logs:

Start at the channel creation and channel Members flows, then reproduce the Invite Users search with a whitespace-containing user name. Trace the frontend search entry point and its tests, if present; done means users can search by whitespace-containing names in both channel creation and adding members.