Fix ui:title for objects (rjsf-team#665) (rjsf-team#676)

Author: davidMcneil

src/components/fields/ObjectField.js

@@ -72,7 +72,7 @@ class ObjectField extends Component {
  {(uiSchema["ui:title"] || title) &&
  <TitleField
  id={`${idSchema.$id}__title`}
- title={title || uiSchema["ui:title"]}
+ title={uiSchema["ui:title"] || title}
  required={required}
  formContext={formContext}
  />}