allow KeePassDX to run in the lock screen

[ttunturi]

Checks

• [x] I have read the Wiki, searched the open issues, and still think this is a new feature.

Explain the problem clearly and succinctly:

When logging in by reading a QR code and using a passkey the workflow is like this:

1. Start with a locked phone
2. Use shortcut (like double-tapping the power button) to launch camera
3. Read QR code
4. Unlock phone
5. Unlock vault
6. Authenticate

Describe the solution you'd like:

One unlock that is step 4 in the aforementioned workflow could be eliminated if KeePassDX (or its relevant Activity) was able to run in the lock screen.

Describe alternatives you've considered:

No response

Additional context:

No response