Perfect Numbers: add perfect-square abundant test (196)

[wesleywang513]

Add a perfect-square test case where missing sqrt(n) changes classification (196 -> abundant).

Forum thread: https://forum.exercism.org/t/perfect-numbers-perfect-square-test-cases/23862

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[IsaacG]

The CI test shows the .input.number line is over indented.

[wesleywang513]

The CI test shows the .input.number line is over indented.

fixed it

[IsaacG]

Let's give the PR at least 24 hours so people can have a chance to chime in before we merge it.

[glennj]

LGTM