[web/views] fix editcontroller regression
unittest_views_basecontrollers.py's
EditControllerTC.test_edit_mandatory_inlined3_object regressed with
changeset dcbb64d3a1d9 because it relied on POSTing nonexisting eids.
This seems like a silly idea, but let's keep the behaviour unchanged.
if versions_map['cubicweb'][0] == (3, 7, 4):
config['http-session-time'] *= 60
config['cleanup-session-time'] *= 60
config['cleanup-anonymous-session-time'] *= 60