Markdown preview mode doesn't stay in landscape mode in tablet

It was reported in 4307837-zd-woothemes that previewing a Markdown-enabled mode on an Android tablet (Samsung Tablet S7) will automatically switch back to the edit mode after a few seconds.

### Expected
The user expects the preview mode stays when previewing the note in the landscape mode.

### Observed
The app switched back to the note editing view after a few seconds. This doesn't happen when previewing a Markdown-enabled mode with the landscape mode on an Android phone and with the portrait mode on an Android tablet.

### Reproduced
1. Enable the automatic orientation switching mode on an Android tablet.
2. Launch the Simplenote app and change the tablet into landscape mode.
3. Preview a Markdown-enabled note.
4. Notice that the app switches to the editing mode after a few seconds.

The link to the video recording can be found in the ticket.

User's device information:
Device Make: Samsung
Device Model: Tablet S7
Simplenote Version: 2.20

Reproduce the issue on a Samsung Tablet S7 with automatic orientation switching, using the listed steps and the linked video if available. Trace the Android orientation and Markdown preview flow to find why landscape preview returns to editing; done means the preview remains visible in landscape while the other reported cases continue to work.

Written by the indexing model from the issue text.