Make more mentions clickable

[brian6932]

Checklist

• I'm reporting a problem with Chatterino
• I've verified that I'm running the most recent nightly build or stable release
• I've looked for my problem on the wiki
• I've searched the issues and pull requests for similar looking reports

Describe your issue

Valid username to spec regex, for reference

[A-Za-z\d]\w{0,24}

Screenshots

Current behavior:

The expected behavior is for most or all of these to be clickable mention elements, not just text

OS and Chatterino Version

v2.5.1-beta.1