[FIX] Omnichannel custom fields are not rendered properly

[reinaldonetof]

Proposed changes

Fix the labels and values within the custom fields

Depends on #3294

Issue(s)

App crashes when trying to save
Also, the Edit Room form is not deal well with all types of fields, as you can see below([Object Object], check promotion custom field configuration on Multiverse server)

How to test or reproduce

1 - Activate Omnicahnnel -> https://docs.rocket.chat/guides/omnichannel-guides/omnichannel-admins-guide
2 - Go to Omnichannel Custom Fields (Enterprise edition)
3 - Create a new custom field
4 - Start a new chat through Livechat
5 - Go to Omnichannel Queue (Mobile)
6 - Open an incoming chat
7 - Go to Room info panel
8 - Edit Room
9 - Change custom field value
10- Save Room

Screenshots

Before	After

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments

[AlexAlexandre]

LGTM

[AlexAlexandre]

LGTM