ErrorActivity is not showing in non-debug version when the application is crashing.

[MohitMaliFtechiz]

Describe the bug
While fixing the #3600 I made an APK for the user to send the details of the crash that he facing on his device, so when I was testing the scenario, I noticed that the ErrorActivity is not showing if the application crashes.

Expected behavior
It should show the ErrorActivity for reporting the issue or restarting the application if any crash/ANR happens on the CoreMainActivity in the non-debug variant.

Steps to reproduce the behavior:

1. Try with the Play Store variant.
2. Explicitly throw an exception in CoreMainActivity e.g. RuntimeException.
3. You will see nothing will happen it just stays on the reader screen no ErrorActivity is visible for reporting the issue.

Environment

• Version of Kiwix Android: 3.9.1
• Device: Google Pixel 7a, Samsung Galaxy m21, Android 8 Emulator
• OS version: Android 13, Android 12, Android 8