On: Cross-signing and end-to-end encryption by default

[bhauer]

> Does https://github.com/matrix-org/matrix-react-sdk/pull/4531 look any better? O:-)

Substantially better than the default Riot layout. I hope this gets merged and I get to switch to this soon.

That said, I'd still like a more compact version of the same that further reduces the spacing/padding to make more information fit on a single screen.