[FIX] Create a discussion from NewMessageView

[reinaldonetof]

Proposed changes

Discussions are broken after merged by PR #3939

Exactly at this point: https://github.com/RocketChat/Rocket.Chat.ReactNative/pull/3939/files#diff-1d629f66de52d1d125580803422f6f3d9df9b9b2bd89133846b7c3ff18b85750R57

To resolve this, we needed to change the way we were doing the keyExtractor

Issue(s)

How to test or reproduce

Create a Discussion from NewMessageView

• Go to NewMessageView then try to create a Discussion
• Should work properly and shows the button Encrypted if you entered your E2E key

Create a Discussion inside any channel

• Open a channel
• Click on + icon
• Then will show actions and click in Create Discussion

Screenshots

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