App icon has black color instead of white

### Expected

See the typical blue and white icon, just as in the Google Playmarket
### Observed

App icon is actually blue and black
### Screenshots

| Android main screen | Google Playmarket |
| ---- | ---- |
| | |

### Device
Device Make: Xiaomi
Device Model: Mi A1
Android Version: 9
Simplenote Version: 2.15 (130)

#dogfood #manualtesting

Start by comparing the app icon on the Xiaomi Mi A1 running Android 9 with the Google Playmarket reference shown in the issue. Locate the Android app icon resource that produces the blue-and-black main-screen icon and verify the result against the expected blue-and-white appearance.

Written by the indexing model from the issue text.