`steps_offset` should be set to 1 instead of 0

`steps_offset` should be set to 1 instead of 0. Please make sure to update the config accordingly as leaving `steps_offset` might led to incorrect results in future versions.

scheduler/scheduler_config.json

@@ -6,5 +6,6 @@
   "beta_start": 0.00085,
   "num_train_timesteps": 1000,
   "skip_prk_steps": true,
+  "steps_offset": 1,
   "trained_betas": null
 }