fix swagger templates to correctly handle code generation in case of token authorization

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

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Checklist

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• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality