Yamlfix generates invalid yaml if comment in a block when top level is a list

[nonell-viavi]

First of all, thank you for this fantastic tool!

Now to the issue :)

Description

When the yaml file is organized in a certain way, yamlfix generates invalid YAML as the output.

Steps to reproduce

1. This is the smallest file that reproduces the issue:

   ---
   - a: |-
     # comment
     content

2. Run yamlfix <file.yaml>

Current behavior

This is the resulting file, which is not valid YAML.

---
- a: |-
      # comment
    content

Desired behavior

I would expect the comment to be left as it is, not shifted right. I think yamlfix is treating the comment as a comment instead of text under the |- block.

The interesting bit is that this only manifests when the top level object is a list! (When top level is a dict, this doesn't happen).

---
a: |-
  # comment
  content

^ This is left as it is.

Environment

$ python -c "import yamlfix.version; print(yamlfix.version.version_info())"
------------------------------------------------------------------
     yamlfix: 1.16.0
     Python: 3.11.8
     Platform: Linux-4.18.0-544.el8.x86_64-x86_64-with-glibc2.28
------------------------------------------------------------------