Add test for JS anagram to reject same word regardless of case

Previously a test word that differed only in case from the original word would be considered an anagram, while the exactly identical word would not. It seems like it should be case-insensitive, right?

I modified the example also in a super simple way to pass this additional requirement. I didn't bother refactoring at all, since I heard the examples are no longer intended to actually be good examples, just something that passes the tests.