message: Tweak event border radius to match action bar
  This adjusts the `border-radius` used when hovering on an event to match the
  recently changed value for the action bar (changed to `8px` in
  https://github.com/matrix-org/matrix-react-sdk/pull/6066).
diff: @@ -104,7 +104,7 @@ $left-gutter: 64px;
  .mx_EventTile_line, .mx_EventTile_reply {
  position: relative;
  padding-left: $left-gutter;
  - border-radius: 4px;
  + border-radius: 8px;
  }
  .mx_RoomView_timeline_rr_enabled,
  