Bad escaping character "-" from LDAP #{cn}

Description:

Since version 1.0.0-beta.1 when using #{cn} as a 'field name' in LDAP synchronization, username has bad name escaping with character "-" (only this one) inside:
https://www.dropbox.com/s/0t8g5nyivos9i4i/Zrzut%20ekranu%202019-03-14%2015.39.00.png?dl=0

It should be "frank.white.hd", but now it's bugged to "frank.white.-.hd"

We are using this approach (https://www.dropbox.com/s/s8og4qafhggmrkt/Zrzut%20ekranu%202019-03-14%2015.44.10.png?dl=0), to get nice names in 'Private messages list' (name+surname+department alias):
https://www.dropbox.com/s/nk7h0sn1i12n34g/Zrzut%20ekranu%202019-03-14%2015.37.50.png?dl=0

Steps to reproduce:

1. ActiveDirectory: Add "-" to each CommonName field
2. RocketChat: Set #{cn} in Field Name in LDAP synch
3. RocketChat: Check that username is ugly now :'(

Expected behavior:

Character "-" should be exited like any other is, to null.

Actual behavior:

Character "-" is treated in the username just like other part of name.

Server Setup Information:

• Version of Rocket.Chat Server: 1.0.0-beta.1
• Operating System: debian 9
• Deployment Method: tar
• Number of Running Instances: 2
• DB Replicaset Oplog: on
• NodeJS Version: 8.15.0
• MongoDB Version: 4.0.5

Additional context

It was working just fine in versions below 1.0

Relevant logs:

nope