fix bug for enum

Author: tangram-js

src/components/json-schema-editor/convertTreeToSchema.js

@@ -5,7 +5,7 @@ function clone (source) {
 function convertTypeToSchema (node) {
  let schema = clone(node.value)
  if (node.children && node.children.length > 0) {
- schema.enum = clone(node.children[0].value.enum)
+ schema.enum = clone(node.children[0].value)
  }
  return schema
 }