When the source is prepared again after stop, the period uid
is calculated by subtracting the `firstPeriodId` from the
period uid that is passed in to `createPeriod`. When this
happens after stop, the uid from the old period uid that
is still stored and has the value of the last played uid.
Hence the `firstPeriodId` must not be reset when released.
Issue: google/ExoPlayer#10838
PiperOrigin-RevId: 539028570
(cherry picked from commit de2ad14f46f4790063dfef849ba8cc0069f6106e)
