[bug] Unit converter

[Valdnet]

Current behavior: When entering the number "0" after the decimal comma (dot), the decimal value is reset to zero.

Expected behaviour: After entering the number "0" after the decimal comma (dot), you can enter the next decimal number.

Steps to reproduce:

1. Select "Unit Converter".
2. Select e.g. "Length".
3. Enter a comma "," or ".".
4. Enter the number "0".

The decimal value resets to zero.

App: Android 12 Simple Calculator 5.12.0