chore: clean up linter errors in examples

examples/list-simple/main.go

@@ -45,12 +45,11 @@ func (d itemDelegate) Render(w io.Writer, m list.Model, index int, listItem list
 		}
 	}
 
-	fmt.Fprintf(w, fn(str))
+	fmt.Fprint(w, fn(str))
 }
 
 type model struct {
 	list     list.Model
-	items    []item
 	choice   string
 	quitting bool
 }