Fix code scanning alert - `__eq__` not overridden when adding attributes

[2lambda123]

Tracking issue for:

• [ ] https://github.com/2lambda123/PrincetonUniversity-PsyNeuLink/security/code-scanning/367

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Issues Details of @2lambda123 in PrincetonUniversity-PsyNeuLink :	OPEN	CLOSED	TOTAL
30	0	30

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