Followup r94609: fix jquery.highlightText test cases on IE, simplify test case setup...

Followup r94609: fix jquery.highlightText test cases on IE, simplify test case setup so new ones can be added more trivially, uncommented the failing test case.

These tests were failing on IE 6, 7, and 8 because the innerHTML rendering of the highlighted text came out in caps and without quotes, such that the string didn't match the provided one. By re-normalizing the expected HTML form this check now works on those browsers. Switching common code to a loop and an array makes it easier to add new test cases: less duplication of code, and no need to manually update the number of test cases.

Note that the third test case was previously commented out, but looks like a serious regression. No longer commented out, so this will fail!