SBRM — Clean up additional metadata in the report structure ontology

The report structure ontology contains two undocumented properties, both boolean data properties, and adds an unnecessary synonym to a class in an imported ontology. These things should be cleaned up prior to finalization.

This ontology is not documented in detail in the specification document as it is well aligned with the metamodel, but the machine readable file(s), in all serializations, should be corrected. The specification itself is not impacted, in other words.