Jellyfin NFO preset missing thumb tag for actor images

What tinyMediaManager version are you using?

Version 5.1.8 nightly

Description of the issue

Jellyfin's XML parser relies on the <thumb> tag to display actor images. However, the Jellyfin preset in tMM does not include actor image URLs, resulting in blank actor profile pictures in Jellyfin's UI. In contrast, presets like Kodi that include the <thumb> tag will correctly display the images in Jellyfin's UI.

What is the actual behavior?

When using the Jellyfin NFO format, the actor thumb tag is not written to the NFO file.

What is the expected behavior?

When using the Jellyfin NFO format, the actor thumb tag should be written to the NFO file.