[ical4j 4.x] Fix failing jtx Board tests

Currently some of the jtx Board tests are failing.

<img width="786" height="489" alt="Image" src="https://github.com/user-attachments/assets/a39d8cc5-f889-4f66-980d-5f09e61bab9e" />

Make sure all of the tests are passing.

Note: jtx Board has to be installed on the Android device or emulator that is used to run the tests.