Resume Audio playback not possible - jumps back to the start

## Steps to reproduce
1. Move the playback marker of an audio message to the middle of the duration.
2. Tap the play button.
3. See how the playback marker jumps back to the start and the message plays from the beginning.

### Expected behaviour
Playback should start from the position selected with the playback marker.

### Actual behaviour
Playback starts from the beginning.

## Device information

**Device:** iPhone 11

**iOS version:** 18.6.2

**Talk version:** 22.0.0

## Server information

**Nextcloud version:** 31.0.9

**Talk version:** 21.1.5

No source files or tests are named. Start by reproducing the issue on an iPhone 11 with the listed iOS, Talk, and Nextcloud versions, then trace the audio message playback and seek handling. Done means tapping play after moving the marker starts playback from the selected position rather than the beginning.

Written by the indexing model from the issue text.