RFR: 8302858: Polish FlightRecorderMXBeanImpl [v3]

[Per Minborg]

On Mon, 20 Feb 2023 17:18:49 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Because it must be a String as we are iterating over Map.Entry<String, String>
>
> Only at compile time. A user could send data over the network using other types.

Thanks for clarifying this. I have reverted accordingly.

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PR: https://git.openjdk.org/jdk/pull/12656