Use contact names in channel contexts

[michaelWuensch]

Description

Channels were named Unnamed(...) although they were opened with a peer in the contact list. This appeared on several places in the app in regards to channels.

Motivation and Context

Further improve UX

How Has This Been Tested?

On my S9

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the Contribution document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.