Messages in thread view have their first line indented

[robintown]

Steps to reproduce

1. Use modern layout
2. View a thread

Outcome

What did you expect?

Uniform indentation

What happened instead?

Operating system

NixOS unstable

Browser information

Firefox 99.0.1

URL for webapp

develop.element.io

Application version

Element version: b5336c9-react-36fd9cb0d4a7-js-2ebf33544f2a Olm version: 3.2.8

Homeserver

Synapse 1.57.0

Will you send logs?

No

[luixxiul]

Introduced with https://github.com/matrix-org/matrix-react-sdk/pull/8442/files#diff-bd83194d78de871bc4ad1c4e8d43102c4368481bbb90705152d3d17fea813919R892.