chore(client): adjust backend placeholder with localhost (freeCodeCamp#59765)

Author: ShaunSHamilton

client/src/templates/Challenges/projects/solution-form.tsx

@@ -81,15 +81,15 @@ export class SolutionForm extends Component<SolutionFormProps> {
       case challengeTypes.backend:
         formFields = solutionField;
         options.isLocalLinkAllowed = true;
-        solutionLink = solutionLink + 'https://3000-project-url.gitpod.io/';
+        solutionLink = solutionLink + 'http://localhost:3000/';
         break;
 
       case challengeTypes.backEndProject:
         formFields = backEndProjectFields;
         // options.required.push('githubLink');
         options.isSourceCodeLinkRequired = true;
         options.isLocalLinkAllowed = true;
-        solutionLink = solutionLink + 'https://3000-project-url.gitpod.io/';
+        solutionLink = solutionLink + 'http://localhost:3000/';
         solutionFormID = 'back-end-form';
         break;