Add `steps_offset=1` to config to suppress deprecation warning

Hey Waifu-Diffusion!

We have introduced a `steps_offset` variable to scheduler configs to have a cleaner API and now want to incentivize SD schedulers to add this to the config as otherwise it'll eventually lead to silent errors.
See: https://github.com/huggingface/diffusers/blob/7258dc4943e73b8799003771e86a44424afb996d/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py#L60

Best,
Diffusers Team!

scheduler/scheduler_config.json

@@ -8,5 +8,6 @@
   "num_train_timesteps": 1000,
   "set_alpha_to_one": false,
   "timestep_values": null,
-  "trained_betas": null
+  "trained_betas": null,
+  "steps_offset": 1
 }