fix: images not loading in editor (#7099)

[sproott]

Summary

Image assets were not loading in the editor view. Bug was introduced in #7004.

fixes #7099

Test plan

Before:

https://github.com/decaporg/decap-cms/assets/46423131/94a3dc9c-5860-4ab4-8726-8c4c1a7ce828

After:

https://github.com/decaporg/decap-cms/assets/46423131/ce19cfa2-79de-4ff4-9b5f-1ac5ac6c8fa5

Checklist

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