Remove incorrect RGB channel reversal logic from dataloaders

[Copilot]

The RGB logic in ap_dataloader_dali.py and data_decord_llava_vit.py was inverting color channels incorrectly. Since decord.VideoReader already returns RGB, the [:, :, :, ::-1] operation was converting RGB→BGR when use_rgb=True—the opposite of intended behavior.

Changes

• Removed erroneous channel reversal from _load_video_data() in both files:

# Removed:
if self.use_rgb:
    video_data = video_data[:, :, :, ::-1]

Original prompt

dataloader/ap_dataloader_dali.py
dataloader/data_decord_llava_vit.py

这两个里面rgb的逻辑是错的，你给我删掉吧

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