cleaning up another Oracle test

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-3.1@1566008 13f79535-47bb-0310-9956-ffa450edef68
CAY-1470 Oracle: Problem with bind CHAR in select

removing CAY-1470 test - after all the issue is not fixed, and we can't get a clean build

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-3.1@1566009 13f79535-47bb-0310-9956-ffa450edef68