Update validate-inactive-3a-response-parameters.json

[lawley]

Support optional code and system values and more precise issue location

[grahamegrieve]

Why these changes?

[lawley]

Aligned with this from requirements.md

• The server SHALL return system, code and display for the code that it considered valid, along with the version if this is known

Ontoservers implements

• The server SHOULD return system, code and display for the code that it considered invalid, along with the version if these are known

Also, it is specifically the Coding.code that is at issue here rather than, for example, the Coding.display

[grahamegrieve]

but it's not valid. And the problem is the concept, not the code

[grahamegrieve]

ok