[tablet] Keyboard is swiftly shown and hidden when tapping note in note list during search

**Note:** this is reproduced on tablet simulator in horizontal mode. I have no possibility to check if this is reproducible on a real tablet.

### Expected
Tapping a note in note list should not cause a keyboard to be shown/hidden.

### Observed
When the tablet is in horizontal mode, and the note list is in search mode, tapping a note in note list shows and hides the keyboard really fast several times:

https://user-images.githubusercontent.com/73365754/128883171-69379c1a-9a9a-4e62-9358-2bf4bb9934f8.mov

### Reproduced
1. Run Simplenote on a tablet in horizontal mode
2. Start search and enter a keyword that is present in at least one note
3. Once search is executed, hide the keyboard
4. Tap the note in note list ~> you will see keyboard being shown/hidden several times on every tap.

Device Make: Google
Device Model: `Pixel C` tablet created via Android Studio AVDM
Android Version: 11
Simplenote Version: 2.19-rc-1

Start by reproducing the issue on the Pixel C Android 11 tablet simulator in horizontal mode, following the listed search and note-tap steps. Trace the search-mode note-list tap and keyboard focus behavior. Done means tapping a note no longer shows or hides the keyboard repeatedly, and the reproduction scenario no longer occurs.

Written by the indexing model from the issue text.