UnslothVisionDataCollator cannot handle a tuple as patch size

[anderlem]

UnslothVisionDataCollator expects that the model patch size is a single int at

unsloth-zoo/unsloth_zoo/vision_utils.py

Line 660 in ea85a26

self.patch_size = model.config.vision_config.patch_size

, but there are model configs such as https://huggingface.co/OpenGVLab/InternVL3-2B-hf/blob/main/config.json specifying a tuple of 2 ints. UnslothVisionDataCollator then crashes when it tries to do arithmetic with the patch size. This bug was did not exist in older unsloth-zoo versions.