[INTERNAL] corrected parts in the plugin.xml for user class move

Seems the refactor engine is unable to refactor the xml file.

****** Eclipse XML *******

Change-Id: Ibe30453b526f9c4d4e032c49b55a50c880cd6204
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1426
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>