Update backend/app/controllers/user.controller.js

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

backend/app/controllers/user.controller.js

@@ -40,7 +40,7 @@ export async function register(req, res) {
 
         const id = result.rows[0].id;
 
-        const playlistQuery = `INSERT INTO playlists (name, owner) VALUES ('A regarder plus tard', $2)`;
+        const playlistQuery = `INSERT INTO playlists (name, owner) VALUES ('A regarder plus tard', $1)`;
         await client.query(playlistQuery, [id]);
 
         console.log("Successfully registered");