fix(client): restore only the contents of the challenge files

client/src/templates/Challenges/redux/code-storage-epic.js

@@ -98,7 +98,20 @@ function loadCodeEpic(action$, state$) {
 
       const codeFound = getCode(id);
       if (codeFound && isFilesAllPoly(codeFound)) {
-        finalFiles = codeFound;
+        finalFiles = {
+          ...fileKeys.map(key => files[key]).reduce(
+            (files, file) => ({
+              ...files,
+              [file.key]: {
+                ...file,
+                contents: codeFound[file.key]
+                  ? codeFound[file.key].contents
+                  : file.contents
+              }
+            }),
+            {}
+          )
+        };
       } else {
         const legacyCode = getLegacyCode(legacyKey);
         if (legacyCode && !invalidForLegacy) {