Remove pdb.set_trace() in scenario.

tests/scenario_bank_statement_payment_bank_discount.rst

@@ -471,7 +471,6 @@ invoice, selecting the invoice and the payment::
     >>> statement_line6, statement_line7 = statement5.lines
     >>> st_move_line = statement_line6.lines.new()
     >>> st_move_line.invoice = customer_invoice2
-    >>> import pdb;pdb.set_trace()
     >>> st_move_line.payment == payment2
     True
     >>> st_move_line.amount