Change EA-based examples to include offspring-fraction

Summary

EA-based examples are missing the offspring-fraction property and are, therefore, broken.

Component

core.ea

Steps to reproduce

Execute search-with-benchmark example.

Current Behaviour

EvoAl terminates without calculating the results.

Expected Behavior

Should work.

Possible fixes

Add the offspring-fraction to the configuration

Contact Person

@lau_pau reported this bug