Last Viewed Tab is not Always Shown from Widget

### Expected
The last-viewed tab is shown when opening a note from the widget whether the tab is ***Edit*** or ***Preview***.

### Observed
The last-viewed tab is shown when opening a note from the widget when the tab is ***Preview***.

### Reproduced
0. Add widget to home screen for note with markdown enabled.
1. Tap widget from Step 0.
2. Notice note shows ***Edit*** tab.
3. Tap ***Preview*** tab.
4. Tap back arrow in app bar.
5. Tap widget from Step 0.
6. Notice note shows ***Preview*** tab.
7. Tap ***Edit*** tab.
8. Tap back arrow in app bar.
9. Tap widget from Step 0.
10. Notice note shows ***Preview*** tab.

Make|Model|Android Version|App Version
-|-|-|-
Google|Pixel 3|9.0|1.8.2

Start by reproducing the widget flow on Android with a markdown-enabled note, following the listed Edit and Preview steps. Trace how the widget opens the note and how the last-viewed tab is retained across the app-bar back action. Done means reopening from the widget shows whichever tab was last viewed, including Edit.

Written by the indexing model from the issue text.