fix sed

Dockerfile

@@ -49,9 +49,11 @@ RUN git clone https://github.com/lllyasviel/Fooocus . && \
     # pin to a specific commit
     git checkout 18a8c6655208c31216b83bd93381cb12993597c2 && \
     # remove the next line if you're running on your own GPU
-    sed -i "s/image_number = gr.Slider(label='Image Number', maximum=32/image_number = gr.Slider(label='Image Number', maximum=3/" webui.py && \
+    sed -i "s|image_number = gr.Slider(label='Image Number', minimum=1, maximum=32|image_number = gr.Slider(label='Image Number', minimum=1, maximum=3|" webui.py && \
     pip install --no-cache-dir -r requirements_versions.txt --extra-index-url https://download.pytorch.org/whl/cu118
 
+# Checkpoints
+
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH \
     PYTHONPATH=$HOME/app \