[web test] repair test broken by 0872ac2a1db0
after the above cset, during test instance's url is set before the creation of
core entities (ie created at database initialization), hence they have now a
valid cwuri.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')