[SYNCOPE-537] Deleted unnecessary underscore to comply with GuardedString of 1.4.0.0 connid version (GuardedStringDeserializer)

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_2_X@1615535 13f79535-47bb-0310-9956-ffa450edef68