Revert "Update arkane/explorerTest.py."

This reverts commit d59da68.

Lesson to be learned: If a unit test fails, make sure you
understand why before changing the correct answer...

arkane/explorerTest.py

@@ -76,7 +76,7 @@ def test_reactions(self):
         """
         test that the right number of reactions are in output network
         """
-        self.assertEqual(len(self.explorerjob.networks[0].pathReactions), 5)
+        self.assertEqual(len(self.explorerjob.networks[0].pathReactions), 6)
 
     def test_isomers(self):
         """