fix pr body path

Author: Bot

actions/add-code-submission-to-db.js

@@ -17,8 +17,8 @@ const main = async () => {
   console.log(JSON.stringify(context, null, 2));
   console.log(JSON.stringify(context.pull_request, null, 2));
 
-  if (context.pull_request) {
-    prBody = context.pull_request.body;
+  if (context.payload.pull_request) {
+    prBody = context.payload.pull_request.body;
   } else {
     const octokit = github.getOctokit(process.env.TOKEN);