Remove list style from Percy test of a reply chain on `timeline.spec.ts`

[luixxiul]

Steps to reproduce

1. Check Percy snapshots below for https://github.com/matrix-org/matrix-react-sdk/pull/10450:
   • EventTile with reply chains on modern layout
   • EventTile with reply chains on compact modern layout
   • EventTile with reply chains on IRC layout
   • EventTile with reply chains on bubble layout

Outcome

What did you expect?

The list style should not be applied in the same way as on the main timeline.

What happened instead?

It is applied as below:

Please note that the position of the disc differs among the browsers. Above is the snapshot on Safari. The disc does not appear on Firefox.

Operating system

No response

Browser information

Chrome (Edge) and Safari

URL for webapp

No response

Application version

No response

Homeserver

No response

Will you send logs?

No

[luixxiul]

This one is hard to spot, but there is a disc covered by the avatar H on the first line.

[t3chguy]

Percy tests are gone