Transcript timestamps are off

[delexagon]

Describe the bug
In hearings, there is a semi-rare when clicking on a timestamp will move the video/timestamp to the transcript item before the one clicked.

To Reproduce
Steps to reproduce the behavior:

1. Go to a hearing and click on the link for each timestamp.
2. About 1/60 (probably) timestamps will instead move the highlight to the previous item when clicked.

Expected behavior
Clicking on a timestamp should always move to that transcript item.

Actual Results + Screenshots
Clicking on a timestamp rarely moves the highlight to the previous transcript item.

Device:
Any

Additional context
Simple fix, making this issue to remember to do it. It's something to do with the seconds rounding in components/hearing/Transcription.tsx.