Fix for Common Parameter Name used in Generated code

[ChrisPulman]

What kind of change does this PR introduce?

closes #1724

What is the current behavior?

ex is used within the generated code, this is a common name

What is the new behavior?

Updated ex to be refit_ex to minimise the likelihood that there will be conflict.

What might this PR break?

None expected due to new name

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[TimothyMakkison]

Would ______refit_ex or ______ex be better here? Similar to how the variables and properties are handled.

[ChrisPulman]

Would ______refit_ex or ______ex be better here? Similar to how the variables and properties are handled.

Yes, that's a fair point, I am happy with that, I will update to ______ex later.
I was thinking along the lines of having refit in the name of the generated code would be more of an identification of source. But will stick with the previous trend until now.

[github-actions]

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