Undo the recent change to message grouping

Originally, Discord would consider a message group as ending after an 8 minute gap between two messages.

This meant that even if a user sent messages over an entire hour, only the top message would be given an icon and timestamp as long as they didn't let 8 minutes pass without a message during that hour and they weren't interrupted by another user.

This gave inane ramblings a very clean look.

However, the new rule for message groups is that they simply end 8 minutes after the first message.

This means that message groups get cut off in completely arbitrary places. I already found it annoying enough that message groups get cut off at midnight, but that pales in comparison to message groups being split arbitrarily at any time of day.

Honestly the main reason I don't like it is that it highlights when I've been talking to myself for ten minutes straight and makes me look like a gigantic nerd. Which isn't wrong, but...