docs: delete test code

Author: tangjinzhou

components/form/demo/time-related-controls.vue

@@ -62,7 +62,6 @@ export default {
     this.form = this.$form.createForm(this);
   },
   data () {
-    window.form = this;
     return {
       formItemLayout: {
         labelCol: {

components/form/demo/validate-other.vue

@@ -171,7 +171,6 @@ Demostration for validataion configuration for form controls which are not show
 <script>
 export default {
   beforeCreate () {
-    window.test = this;
     this.form = this.$form.createForm(this);
   },
   data: () => ({