Fix bug in inlet profile writer.

[bigfooted]

Proposed Changes

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When no inlet profile exists, su2 creates one for you. There was a bug where the index of the marker was used to look up the string of column names, instead of the index of the inlet markers.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.

PR Checklist

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• I am submitting my contribution to the develop branch.
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