Unit tests: fix regression in r31163 causing some tests not to be run entirely

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39284 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/Sequence.py

@@ -191,6 +191,7 @@ class SequenceList:
   def play(self, context, quiet=0):
     i = 1
     for sequence in self._sequence_list:
+      sequence._played_index = 0
       sequence.play(context, sequence_number=i, quiet=quiet)
       i+=1