Clean air-nozzle cfg

[TobiKattmann]

Proposed Changes

small follow-up to #1571, stripping comments and removing some unnecessary options

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with the '-Wall -Wextra -Wno-unused-parameter -Wno-empty-body' compiler flags, or simply --warnlevel=2 when using meson).
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• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp) , if necessary.

[pcarruscag]

Are you removing the primal/adjoint duplication? or that didn't work?

[pcarruscag]

Ah right I missed a step in the other PR 👍

[TobiKattmann]

Thanks for taking a second look and for approving :)