Fix the name of a variable in some tests.
Description
Fix the name of a variable in some tests. The tests are not affected because the default value (4) is enough to converge.
Closes #301 (closed).
News snippet
Fix the name of a variable in some tests.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.