[uss_qualifier] Fix Constraint Reference reference to DSS0210,A2-7-2,3[a,b,c,d]

[the-glu]

This PR contribute to interuss/dss#1439

Analyzing reason for unimplemented requirements, I noticed that astm.f3548.v21.DSS0210,A2-7-2,3c and astm.f3548.v21.DSS0210,A2-7-2,3d seems to be implemented.

Text is

3. *deleteOperationalIntentReference, deleteConstraintReference:* Tests must demonstrate that an entity reference can be deleted on any DSS instance in the DSS pool and the deletion is reflected on all DSS instances in the DSS pool using queryOperationalIntentReferences (<tt>DSS0210,A2-7-2,3a</tt>), getOperationalIntentReference (<tt>DSS0210,A2-7-2,3b</tt>), queryConstraintReferences (<tt>DSS0210,A2-7-2,3c</tt>), and getConstraintReference (<tt>DSS0210,A2-7-2,3d</tt>).

And here we're working with constraints, not operational intents. I do assume something was copy-pasted when implementing it and it was forgotten ?