Install xformers at the same time as requirements in notebook to fix issues.

notebooks/comfyui_colab.ipynb

@@ -35,8 +35,7 @@
       "source": [
         "!git clone https://github.com/comfyanonymous/ComfyUI\n",
         "%cd ComfyUI\n",
-        "!pip install -r requirements.txt\n",
+        "!pip install xformers -r requirements.txt\n",
-        "!pip install xformers\n",
         "!sed -i 's/v1-inference.yaml/v1-inference_fp16.yaml/g' webshit/index.html"
       ]
     },