Fix the Last Remembered Sermon

The application does not correctly remember the last sermon after turning off the car and thereby closing the Branham Player app. It seems to remember the last sermon played during its first session and none after that.

Steps to Reproduce:

1. Install a fresh version of the app and browse through several sermons in Android Auto. Don't play them to completion, just start each one and note the name of the last one.
2. Completely close and reopen the app in Android Auto
3. Note the queued sermon matches the one recorded in step one
4. Browse to a separate sermon and start playing that one. Note the name of this sermon.
5. Completely close and reopen the app in Android Auto
6. Note the queued sermon matches the one recorded in step one

Expected Result:

The sermon noted in step one reappears in step three, and the one recorded in step four is opened during step six.

Actual Result:

The sermon noted in step one reappears in steps three and six.