Fix lint error in DOM fixtures (#10369)

Author: bvaughn

fixtures/dom/src/components/fixtures/date-inputs/index.js

@@ -1,10 +1,10 @@
-const React = window.React;
-
 import Fixture from '../../Fixture';
 import FixtureSet from '../../FixtureSet';
 import TestCase from '../../TestCase';
 import SwitchDateTestCase from './switch-date-test-case';
 
+const React = window.React;
+
 class DateInputFixtures extends React.Component {
   render() {
     return (