"LENGTH_DIFF_OVER" signal is not handled properly.As a result of which,this test case failure is reported incorrectly.

LENGTH_DIFF_OVER is checked and registered in diff signals without checking for matching http status response code in method run_default_checks() in base_fuzz.py. Like check is there while registering this as issue but not at the point where it is registered as diff signal itself. This cause a problem suppose we have initiated fuzz like "BUFFER_OVERFLOW_HEADER" and it has 2 test cases.
1. Now take example if test case 1 has detected "LENGTH_DIFF_OVER" but response status code is different , so signal will remain registered for diff signal and due to status code mismatch it is not reported as issue which is correct.
2. Now in test case 2, where there is no length diff but the diff signal is already registered with "length diff" in test case 1, so suppose in case the response code matches then issue will be reported as length diff where it was actually not there.