servlet-feature-pack-licenses.xml - remove org.glassfish:javax.json and javax.json:javax.json-api licences

These dependencies are not audited in the servlet-feature-pack-licenses.xml files, instead they can be found in core-feature-pack-licenses.xml which is generated by wildfly-core. That means we can remove them from servlet-feature-pack-licenses.xml.

This issue will facilitate the creation of product branches from the community ones.