slapos_payzen: Update and clean up payzen tests

   Unhardcode the default test data (always create the Payzen Service).
   Use @simulate decorator to clean up tests.
   Minor updates to fixup tests from others changes.

master/bt5/slapos_payzen/TestTemplateItem/portal_components/test.erp5.testSlapOSPayzenAlarm.py

@@ -99,7 +99,7 @@ class Foo:
   def updateStatus(self):
     pass
 return Foo()
-""" )
+""")
     self.commit()
 
   def _dropPaymentTransaction_createPayzenEvent(self):