[Releng] Re-add the Maven module org.eclipse.emf.cdo.ui

For an unknown reason commit 0d1b2629e65c195bddae1f08f5ecdbd82d7a6ad2
has removed the org.eclipse.emf.cdo.ui module from the file
/org.eclipse.emf.cdo.releng.parent/plugins/pom.xml. Adding it back.
2 files changed