Remove wrong type

Author: jehousoh

backend/collaboration/src/models/Session.ts

@@ -7,7 +7,7 @@ import mongoose, { Document, Schema } from "mongoose";
 export type TSession = {
   collabid: string;
   users: [string];
-  language: [string];
+  language: string;
   question_id: number;
   code: string;
   createdAt: Date;