[Android] App theme isn't selected via global theme setting.

[the4anoni]

Describe the Bug
Default theme is always white, app ignores system-wide android theme setting.

Steps To Reproduce

1. Run app.

Expected Result

App launches with theme based on theme flag.

Actual Result

App will always launch with white theme, until it will be changed manually in app settings.

Environment

• Device: Samsung Galaxy S10
• Operating system: Android Q OneUi 2.1
• Build Version: 2.3.1 (2413)

[jean-io]

Same on iOS: no system wide dark mode support.