fixing the script modified twice running each time bug. chucknorris/roundhouse#5

Author: ferventcoder

product/roundhouse/databases/DefaultDatabase.cs

@@ -279,6 +279,7 @@ public string get_current_script_hash(string script_name)
 
             DetachedCriteria crit = DetachedCriteria.For<ScriptsRun>()
                 .Add(Restrictions.Eq("script_name", script_name))
+                .AddOrder(Order.Desc("id"))
                 .SetMaxResults(1);
 
             try