[FIX] Threads not being updated and other related issues

[diegolmello]

Proposed changes

• Fixed parent title on thread header breaking lines
• When unread on top is set, channels wouldn't leave unread group in some cases
• Fixed thread badge color not being updated on the message's thread button

Issue(s)

Closes #2519

How to test or reproduce

Fixed parent title on thread header breaking lines

• Create a thread on a room with a long name (or a discussion from a long message)
• Subtitle shouldn't break lines

When unread on top is set, channels wouldn't leave unread group in some cases

• Enable Unread on top
• Mark a channel as unread
• Mark it as read
• Channel should leave Unread group

Fixed thread badge color not being updated on the message's thread button

• Focus a room with a thread you're following
• Send a message from a different user on a thread you're following
• Thread badge color should update
• Enter in the thread
• When you leave it, the badge color should update

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

[djorkaeffalexandre]

LGTM