fix header list arguments to use correct type

[sbiscigl]

Description of changes:

fixes an issue in codegen where when a header has mlutiple values in a comma deliminated list we generated for the name instead of the type.

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• [x] Did a review by yourself.
• [x] Added proper tests to cover this PR. (If tests are not applicable, explain.)
• [x] Checked if this PR is a breaking (APIs have been changed) change.
• [x] Checked if this PR will not introduce cross-platform inconsistent behavior.
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