cleanup unused import

Author: clairep94

client/modules/Preview/previewIndex.jsx

@@ -9,7 +9,7 @@ import {
 } from '../../utils/dispatcher';
 import { filesReducer, setFiles } from './filesReducer';
 import EmbedFrame from './EmbedFrame';
-import { getConfig, isTestEnvironment } from '../../utils/getConfig';
+import { getConfig } from '../../utils/getConfig';
 import { initialState } from '../IDE/reducers/files';
 
 const GlobalStyle = createGlobalStyle`