fix mappings tests

[syphax-bouazzouni]

In ontologies_linked_data

1. Failure:
   TestMapping#test_mappings_ontology [/srv/ontoportal/ontologies_linked_data/test/models/test_mappings.rb:161]:
   Expected: 504
   Actual: 18

The tests passes if run only the mappings tests, but fails if we run all the tests.

In ontologies_api

1. Failure:
   TestMappingsController#test_mappings_controllers_in_order [/srv/ontoportal/ontologies_api/test/controllers/test_mappings_controller.rb:155]:
   Expected: 18
   Actual: 50

2. Failure:
   TestMappingsController#test_mappings_file_load [/srv/ontoportal/ontologies_api/test/controllers/test_mappings_controller.rb:112]:
   Expected: 21
   Actual: 507

[syphax-bouazzouni]

Fixed

For API

And OLD