fix(web): correct `InputVar` type definition

- Change the `hide` field in the `InputVar` type from required to optional to fix the editor's type error

web/app/components/workflow/types.ts

@@ -198,7 +198,7 @@ export type InputVar = {
   hint?: string
   options?: string[]
   value_selector?: ValueSelector
-  hide: boolean
+  hide?: boolean
 } & Partial<UploadFileSetting>
 
 export type ModelConfig = {