Fix ClusterDecoderRawSpec to work with std::pmr

[ktf]

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[ktf]

@davidrohr @shahor02 @wiechula could you have a look, please? I think the logic is respected, however I am not sure if we have coverage for it in the full system test.

[davidrohr]

@davidrohr @shahor02 @wiechula could you have a look, please? I think the logic is respected, however I am not sure if we have coverage for it in the full system test.

I think actually this class is not even used any more. It was written by Matthias for the original TPC clusters supposed to come from the FPGA. Anyhow, looking at it briefly what you did seems correct. But I didn't test it, and also no idea how I should easily test it.

[ktf]

In that case, I am happy to debug the change, if needed. Merging since all tests are green.