Playing Files is less responsive compared to playing podcasts on the watch

### Description

When playing audio from the episode screen on the watch, it takes longer for the play button to respond when playing a file (`UserEpisode`) compared to playing a podcast episode (`PodcastEpisode`).

This was noted by @ashiagr in https://github.com/Automattic/pocket-casts-android/pull/915#issuecomment-1525249151.

### Step-by-step reproduction instructions

1. Load up the watch app.
2. From the episode screen for a file, tap play and note that there is frequently some delay before the play icon changes and play starts (this delay isn't super consistent in my testing).
3. Switch to the episode screen for a podcast episode
4. From the episode screen for a podcast, tap play and note that there is much less (if any) delay.

### Screenshots or screen recording

https://user-images.githubusercontent.com/1405144/234818459-974093f8-f650-4fbc-ad3a-3285c0da04c7.mp4

### Did you search for existing bug reports?

- [X] I have searched for existing bug reports.

### Device, Operating system, and Pocket Casts app version

7.38 pre-release build, Android 30 wear emulator.

Start in the watch app's episode screen and compare the play-button handling for UserEpisode with PodcastEpisode. Reproduce on the Android 30 Wear emulator using the listed steps, then verify that file playback responds without the reported delay and remains comparable to podcast playback.

Written by the indexing model from the issue text.