DERBY-1997  Misleading text in WwdEmbedded demo source file for Working With Derby

Modified two demo source files to make embedded and client error handling identical.

Patch: DERBY-1997.diff


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1576342 13f79535-47bb-0310-9956-ffa450edef68