Fix incorrect Dimension for guidance inference

Author: saddam213

OnnxStack.StableDiffusion/Diffusers/StableDiffusion/StableDiffusionDiffuser.cs

@@ -74,7 +74,7 @@ protected override async Task<DenseTensor<float>> SchedulerStep(IModelOptions mo
                     var inputLatent = performGuidance ? latents.Repeat(2) : latents;
                     var inputTensor = scheduler.ScaleInput(inputLatent, timestep);
 
-                    var outputBuffer = new DenseTensor<float>(schedulerOptions.GetScaledDimension());
+                    var outputBuffer = new DenseTensor<float>(schedulerOptions.GetScaledDimension(performGuidance ? 2 : 1));
                     using (var outputTensorValue = outputBuffer.ToOrtValue())
                     using (var inputTensorValue = inputTensor.ToOrtValue())
                     using (var timestepOrtValue = CreateTimestepNamedOrtValue(inputMetaData, inputNames[1], timestep))