Fixed transient/persistent argument mixup

[Dr15Jones]

The classes declared in classes_def.xml were meant not to be stored, however,
the wrong XML argument name was used. The used name was 'transient' but the
code actually only looks for the name 'persistent'. This change corrects the error.

[Dr15Jones]

@ktf This is also needed for the THREADED_X build but is a real bug so I figured should go into 7_0_X. It should have no effect on any actual production jobs and if anyone had attempted to store such objects, ROOT would have crashed.

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for CMSSW_7_0_X.

Fixed transient/persistent argument mixup

It involves the following packages:

PhysicsTools/FWLite

@cmsbuild, @vadler, @Degano, @nclopezo can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@ktf you are the release manager for this.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1990/1962/summary.html

[ktf]

@vadler I'm bypassing your signature. Complain if not ok.

[vadler]

@ktf : No complaint.