[JENKINS-64150] Fix blank manifest view

[abioteau]

As describe on #75 and on JENKINS-64150, the repo manifest informations are blanked on existing jobs after restart of Jenkins server on release 1.14.0. It is related to changes made on #62.

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[abioteau]

Hi @francoisferrand, could you have a look on this PR?

[francoisferrand]

revisionState is a large object, which should not be persisted I think; and it will anyway be re-loaded on call to setIndex, hence the transient annotation.
Isn't the @DataBoundSetter annotation enough to fix the problem here?

[abioteau]

I don't know, I cannot test my fix.

I add @DataBoundSetter annotation to follow your comment in #75 but ManifestAction is not created from StaplerRequest.bindJSON() or StaplerRequest.bindParameters(), so I don't think setIndex will be call.

So I remove transient annotation to keep revisionState object has setIndex is only call at creation of ManifestAction.

[abioteau]

Issue solved by #82