MINIFICPP-1940 Remove unused constructor param from FlowConfiguration

[lordgamez]

https://issues.apache.org/jira/browse/MINIFICPP-1940

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[szaszm]

I prefer #1391 over this, but this was easier to review. I'm commenting on the JSON config PR to try to merge this into that one.

[lordgamez]

I think if #1391 is merged, it wouldn't be that hard to resolve the conflicts in this one after a rebase.

[szaszm]

In this case, let's wait for #1391 to be merged before merging this one.