fix: paths treated as hidden

[EmanuelCampos]

Description

Notebooks when using "../../../img_cache" is being treated as a hidden file, making it throw an error that the path doesn't have files

How to reproduce:

from llama_index.multi_modal_llms.openai import OpenAIMultiModal
from llama_index import SimpleDirectoryReader

image_documents = SimpleDirectoryReader("../../../img_cache").load_data()

Keep any image file in the img_cache directory and run (curiously when have a document it's recognized, images no (before the fix)

Fixes # (issue)

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• I stared at the code and made sure it makes sense

Suggested Checklist:

• I have performed a self-review of my own code
• I ran make format; make lint to appease the lint gods

[hatianzhang]

LGTM!