Remove special case for curve widgets

This will never be used now that interpolation information is included
and should have been applied as a `serializeValue` function

src/utils/executionUtil.ts

@@ -108,9 +108,7 @@ export const graphToPrompt = async (
         // The backend automatically unwraps the object to an array during
         // execution.
         inputs[widget.name] = Array.isArray(widgetValue)
-          ? widget.type === 'curve'
-            ? { __type__: 'CURVE', __value__: widgetValue }
-            : { __value__: widgetValue }
+          ? { __value__: widgetValue }
           : widgetValue
       }
     }