delete loaded cleanPatJets after the temporary load if it was not around already #13681
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On a technical side, this cleans up the temporary module loaded to the process only for the purpose of cloning it.
On a practical side, this also recovers back 500MB of extra memory triggered by PATStringCutObjectSelector due to jetCleaning loaded in #13372 / #13115 .
The default cleaner has a non-trivial cleaning selector in tkIsoElectrons and is never used in miniAOD workflow, while the derived cleaners loaded by jetCleaning have trivial selectors only (which do not use much memory).
[it looks like there are enough different context line that this PR is independent from #13372 / #13115 . ]
A better solution for PATStringCutObjectSelector memory use will need a more targeted instantiation selector functions (instead of all possible pat objects).