Subtitles not available when chromecasting

[abuettner93]

Describe the bug
There seems to be a lack of subtitles when chromecasting from the app - they work fine when streaming to the device itself, and when casting from the Jellyfin web interface (e.g. I know they're there and working). Seems an issue with the VLC implementation maybe?

To Reproduce
Just cast some media that has subtitles, and there will be no subtitles available/shown. When you click the subtitles option in the cast window, it just says none available.

Smartphone (please complete the following information):

• Device: iPhone16Pro
• OS: iOS18 Beta 3
• Version 0.20.1 (2)