[FIX] Popover position

[tassoevan]

Closes #10668

[vynmera]

Very nice!! After fiddling around on the current deployment, here's the things I found that still need work:

Emoji picker overlaps the message box (move it up):

Channel 3dots looks a bit unnatural (move it a bit to the left?)

All else looks correct! 🎉

[vynmera]

@ggazzo uhhh, am I the only one seeing these issues (or do they not need to be fixed)?

[vynmera]

Nevermind, it turns out that's how they're meant to be. Guess I lived with the broken version too long :-)
I suppose I might make a PR to fix it later.