CATROID-1345 Fix testIndexOfItemFunction testrunner

[erikcoxx98]

https://catrobat.atlassian.net/browse/CATROID-1345

testIndexOfItemFunction catroid test fails but should pass. Fix of IndexOfItem method behaviour while working with booleans.

Resolve issue with testIndexOfItem method: when passing true or false (Boolean) as parameter the testIndexOfItem method always returned 0.

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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