Update scheduler/scheduler_config.json

scheduler/scheduler_config.json

@@ -23,8 +23,8 @@
    "steps_offset":1,
    "thresholding":false,
    "timestep_spacing":"leading",
-   "trained_betas":"None",
+   "trained_betas":null,
    "use_karras_sigmas":true,
    "use_lu_lambdas":false,
-   "variance_type":"None"
+   "variance_type": null
 }