Draft: chore: code style fixes for reserved function id

Summary

• chore: code style fixes for reserved function id

A follow up style fixup for https://git.picodata.io/picodata/tarantool/-/merge_requests/145

@Gerold103 the previous MR was merged without your review. Please, take a look at the previous MR and if there are any problems with it I'll fix them in a current MR.