Use watch position as timestamp in share dialog

[clarfonthey]

Steps to reproduce

1. Long-press any video on the main page, history, or a playlist that has been partially watched (and thus has a timestamp)
2. Choose to share the video with a timestamp
3. The timestamp always defaults to zero, rather than the current position in the video

Expected behavior

The link should use the timestamp from the current watch position.

Actual behavior

It has a timestamp of zero, always.

LibreTube version

0.24.0

Android version

13

Other details

When YouTube makes a change that prevents the app or available instances from working, this would otherwise be the only easy way to extract the watch position and use another app or the browser client to finish the video.

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• I have written a short but informative title.
• I will fill out all of the requested information in this form.