(CMake): fix the plugin config command

What does this MR do?

Include the appropriate headers in generated registerService files.

How to test it?

Everything should work as before.

You can try the new behavior by removing the macro fwServicesRegisterMacro in the service ::scene2D::adaptor::SHistogramValue since it used a 3 namespaces data.

Associated Issues/Merge Requests

• Issues
  • Fixes #461 (closed)