fix unit test

Author: Jeff Hagen

src/FluentNHibernate.Testing/DomainModel/Mapping/StoredProcedureTests.cs

@@ -91,7 +91,7 @@ public void Can_specify_sql_delete_all_for_subclass()
     {
         var check = "Delete ABC";
         CreateMappingTester(x => x.SqlDeleteAll(check))
-            .Element("//subclass/sql-delete")
+            .Element("//subclass/sql-delete-all")
             .ValueEquals(check);
     }