fix: restore preview background to white (#36714)

client/src/templates/Challenges/redux/index.js

@@ -15,7 +15,6 @@ import { createIdToNameMapSaga } from './id-to-name-map-saga';
 import { createExecuteChallengeSaga } from './execute-challenge-saga';
 import { createCurrentChallengeSaga } from './current-challenge-saga';
 import { challengeTypes } from '../../../../utils/challengeTypes';
-import { userSelector } from '../../../redux';
 
 export const ns = 'challenge';
 export const backendNS = 'backendChallenge';
@@ -183,7 +182,6 @@ export const projectFormValuesSelector = state =>
   state[ns].projectFormValues || {};
 
 export const challengeDataSelector = state => {
-  const { theme } = userSelector(state);
   const { challengeType } = challengeMetaSelector(state);
   let challengeData = { challengeType };
   if (
@@ -225,7 +223,6 @@ export const challengeDataSelector = state => {
       template
     };
   }
-  challengeData.theme = theme;
   return challengeData;
 };