fix IsADirectoryError when running the training code for sd3_dreambooth_lora_16gb.ipynb (#9634)

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fix IsADirectoryError when running the training code

examples/research_projects/sd3_lora_colab/sd3_dreambooth_lora_16gb.ipynb

@@ -196,7 +196,7 @@
       },
       "outputs": [],
       "source": [
-        "!rm -rf dog/.huggingface"
+        "!rm -rf dog/.cache"
       ]
     },
     {