NPI-3685 revert filename discrepancy check function to previous name,…

… as updated name was a bit misleading

tests/test_filenames.py

@@ -124,7 +124,7 @@ def test_determine_file_name(self):
         self.assertEqual(derived_filename_noncompliant_input, expected_filename_noncompliant_input)
         self.assertEqual(derived_filename_compliant_input, expected_filename_compliant_input)
 
-    def test_check_filename_discrepancies(self):
+    def test_check_discrepancies(self):
         """
         Test of the filename vs contents discrepancy checker
         """