Plex Connect: Fix Plex Connect timeline reporting (#2876)

Plex Connect: Fix Plex Connect timeline reporting (#2876)

Fix Plex Connect timeline reporting

Use queue.corrected_elapsed_time instead of player.corrected_elapsed_time
to accurately track current track position. This fixes issues where:
- Timeline reported incorrect elapsed time when playing multiple tracks
- Huge time values were sent after track transitions
- Step forward/back commands used wrong elapsed time reference

The queue tracks per-track elapsed time while player tracks total session time.