[server/test] fix broken test
The first bad revision is:
changeset: 10396:82071f767cb8
user: Sylvain Thénault <sylvain.thenault@logilab.fr>
date: Thu Jun 11 17:35:11 2015 +0200
summary: [schemas] cwuri should be read-only
This changed the number of RQLExpressions to be more than the number of
CWRelations in the test's schema.
Related to #5457566.
(binary:application/vnd.ms-fontobject)