rebel-kblee

fix multicontrolnet `save_pretrained` logic for compatibility

2

# What does this PR do? Fix an inconsistency between `from_pretrained` and `save_pretrained` within the Multicontrolnet class. The `from_pretrained` function returns a directory structure like this: controlnet, controlnet_1, controlnet_2, whereas...

Multi-controlnet formatting issue

1

### Describe the bug Hi. There is an inconsistency between `from_pretrained` and `save_pretrained` within the Multicontrolnet class. The from_pretrained function returns a directory structure like this: controlnet, controlnet_1, controlnet_2, whereas...