[JENKINS-68885] Fix class cast exception when VarMaskRegexEntry data is not bound

[arthas-choi]

JENKINS-68885 Fix class cast exception when VarMaskRegexEntry data is not bound

If you try to create a Maskpassword Pipiline using regex, a class cast exception will occur.

DataBoundConstructor uses String and String as parameters, but in Descriptor, it is sent by casting to VarMaskRegex.

If I change the descriptor to properly use VarMaskRegexEntry, it works fine.

Testing done

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[MarkEWaite]

Thanks!

[MarkEWaite]

I tested interactively to confirm that I could see the problem before this fix and that I could not see the problem after the fix.

[arthas-choi]

@MarkEWaite thanks