Revert "Revert "Remove hard-coded v3 path for closing challenges.""

This reverts commit aba7ffd.

Author: jmgasper

utils/topcoder-api-helper.js

@@ -25,7 +25,6 @@ const m2m = m2mAuth(_.pick(config, ['AUTH0_URL', 'AUTH0_AUDIENCE', 'TOKEN_CACHE_
 
 let topcoderApiProjects = require('topcoder-api-projects');
 let topcoderApiChallenges = require('@topcoder-platform/topcoder-api-challenges-v4-wrapper');
-let topcoderApiChallengesV3 = require('topcoder-api-challenges');
 
 const topcoderDevApiProjects = require('topcoder-dev-api-projects');
 const topcoderDevApiChallenges = require('@topcoder-platform/topcoder-api-challenges-v4-wrapper-dev');
@@ -46,7 +45,6 @@ let cachedAccessToken;
 // Init the API instances
 const projectsClient = topcoderApiProjects.ApiClient.instance;
 const challengesClient = topcoderApiChallenges.ApiClient.instance;
-const challengesClientV3 = topcoderApiChallengesV3.ApiClient.instance;
 
 // Timeout increase to 5 minutes
 challengesClient.timeout = 300000;
@@ -303,9 +301,6 @@ async function closeChallenge(id, winnerId) {
   logger.debug(`Closing challenge ${id}`);
   try {
     let basePath = challengesClient.basePath;
-    if (!config.TC_DEV_ENV) {
-      basePath = challengesClientV3.basePath;
-    }
     const response = await axios.post(`${basePath}/challenges/${id}/close?winnerId=${winnerId}`, null, {
       headers: {
         authorization: `Bearer ${apiKey}`,