[Bug fix] Fix get_file_list() not returning images with uppercase extension.

[kikefdezl]

Motivation

When running demo/demo_large_image.py on a folder of images, no images were used for inference because the get_file_list() function in mmyolo/utils/misc does NOT read uppercase extension images when passing a folder as argument.

Example: Image_001.JPG, Image_002.PNG and Image_003.TIFF are NOT returned by the function, but they should. Many cameras output images with uppercase extensions (such as DJI drones, for example). We should not have to rename our images to be able to infer on them.

Modification

Simple fix: Inside get_file_list(), I simply added the existing flag: case_sensitive=False to the scandir() function from mmengine.

Impact

This PR simply allows users to use the get_file_list() function on folders that contain uppercase, lowercase, or mixed case image extensions.

[CLAassistant]

All committers have signed the CLA.

[OpenMMLab-Assistant-004]

Hi @kikefdezl ！We are grateful for your efforts in helping improve mmyolo open-source project during your personal time.

Welcome to join OpenMMLab Special Interest Group (SIG) private channel on Discord, where you can share your experiences, ideas, and build connections with like-minded peers. To join the SIG channel, simply message moderator— OpenMMLab on Discord or briefly share your open-source contributions in the #introductions channel and we will assist you. Look forward to seeing you there! Join us ：https://discord.gg/UjgXkPWNqA
If you have a WeChat account，welcome to join our community on WeChat. You can add our assistant ：openmmlabwx. Please add "mmsig + Github ID" as a remark when adding friends：）

Thank you again for your contribution❤