anagram: tests should not require specific order for returned list

[roadfoodr]

The anagram problem description does not specify a requirement that the elements of the returned sublist be in any particular order. However, tests in the suite check against a particular ordered list (instead of checking that all the elements of the list are present).

Motivation: in my solution, I wanted to return a list of unique anagrams (although the problem description does not require this.) I included a call to set() in the process, which changed the order of elements.

If there is interest in relaxing this requirement in the test suite, I will be happy to attempt a pull request.

[cmccandless]

@ydrecords Feel free to submit a PR. For testing purposes, please check your changes to the test suite against both your solution and the example solution as-is to verify that no bugs are introduced.

[cmccandless]

Closed in #1828