Access without entering PIN

[Lexus123]

Describe the bug
Being able to gain access to the app without entering a PIN.

To Reproduce
Steps to reproduce the behavior:

1. Force quit all apps (or at least Zap).
2. Tap the Zap app icon to launch the app.
3. Don't enter your PIN.
4. Swipe up from the bottom of your screen to go back to your iPhone home screen. Don't force quit Zap, just leave it in the background.
5. Open a random app (something like the App Store).
6. Quick switch to the previous app (Zap) by swiping from left to right on the bottom of your screen.

Expected behavior
Zap opens and shows the PIN screen.

Actual behavior
Zap opens without entering a PIN and shows the send/receive/balance screen or the screen to select a node.

Your environment

• Device: iPhone 12
• OS: iOS 14.2
• Version: 0.5.2