(autofix) Fix simple change fix step formatting errors

[roaga]

https://sentry.sentry.io/issues/6073281498/
and
https://sentry.sentry.io/issues/6079570314/

Cause: after user responds to Q&A and plan+code is restarted, we add another initial prompt (the one belonging to the +code part of plan+code). We shouldn't be doing this.

https://langfuse.getsentry.net/project/clx9kma1k0001iebwrfw4oo0z/traces/830dbee4-c07e-4ba6-a60e-9117ebd1604c?observation=397db2b8-9c21-4fa0-82b4-02bddaa8addb