Fix code scanning alert - First parameter of a method is not named 'self'

[2lambda123]

Tracking issue for:

• [ ] https://github.com/2lambda123/PrincetonUniversity-PsyNeuLink/security/code-scanning/1630

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Thanks @2lambda123 for opening this issue!

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[gitginie[bot]]

@2lambda123! Thank you for your contribution to this repository! We appreciate your effort in opening issue. Happy coding!

[git-greetings[bot]]

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

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