update smooth button on refresh

Author: lakshith-403

app/ui/src/analyses/experiments/chart_wrapper/view.ts

@@ -381,6 +381,7 @@ export class ViewWrapper {
         this.scaleButton.isToggled = this.dataStore.chartType > 0
         this.focusButton.isToggled = this.dataStore.focusSmoothed
         this.smoothSlider.value = this.dataStore.smoothValue
+        this.leftSmoothButton.isToggled = this.dataStore.smoothFunction === SmoothingType.LEFT_EXPONENTIAL
 
         this.optionRowContainer.innerHTML = ''
         this.optionRowContainer.classList.add('chart-options')

app/ui/src/components/charts/utils.ts

@@ -255,6 +255,6 @@ export function getSmoother(smoothingType: string, opt: SeriesSmoothingOptions):
         case SmoothingType.LEFT_EXPONENTIAL:
             return new ExponentialMovingAverage(opt)
         default:
-            throw new TwoSidedExponentialAverage(opt)
+            throw new Error(`Unknown smoothing type: ${smoothingType}`)
     }
 }