(re-)introduce transparant lookup in GenFSR

Introduce transparant lookup in the std::map used in GenFSR. This was not done before, as it triggered a spurious schema evolution (i.e. ROOT did not realize that the change of type due to the slightly different comparison operator is immaterial to the actual schema of the class) which should no longer be the case for more up-to-date ROOT versions...

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• ea198109 - re-introduce transparant lookup

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mentioned in issue Moore#540 (closed)

assigned to @graven

requested review from @sponce

/ci-test

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• [2023-03-07 11:10] Validation started with lhcb-master-mr#7246

assigned to @jhorswil

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mentioned in commit d6105005