Update nodes_list.py - CR_LoadImageListPlus

[MilitantHitchhiker]

The key changes are: The use of cls instead of s in the INPUT_TYPES method. The handling of image file extensions, where only .webp, .jpg, .jpeg, and .png files are processed. The loop to process all the images between the start_index and the end of the list, ensuring all the images are handled correctly.

Problems resolved: CR_LoadImageListPlus now correctly processes the full list as intended. Skips over non-image files, preventing a workflow stopping error.