fix STS generated package registration (plugin.xml)

plugins/org.polarsys.chess.chessmlprofile/plugin.xml

@@ -561,6 +561,14 @@
             class="org.polarsys.chess.chessmlprofile.SystemModel.STS.STSPackage"
             genModel="model/CHESS.genmodel"/>
    </extension>
+   
+   <extension
+         point="org.eclipse.uml2.uml.generated_package">
+      <profile
+            location="pathmap://CHESSML_PROFILE/CHESS.profile.uml#_-aQIUKbREeSHP5PnCeTneg"
+            uri="http://CHESS/SystemModel/STS">
+      </profile>
+   </extension> 
 
    <extension point="org.eclipse.emf.ecore.generated_package">
       <!-- @generated CHESS -->