Fix firebase_user

Author: vtm9

services/app/apps/codebattle/lib/codebattle/auth/firebase_user.ex

@@ -59,15 +59,13 @@ defmodule Codebattle.Auth.User.FirebaseUser do
       {:ok, %Req.Response{status: 200, body: body}} ->
         firebase_uid =
           body
-          |> Jason.decode!()
           |> Map.get("localId")
 
         {:ok, firebase_uid}
 
       {:ok, %Req.Response{status: 400, body: body}} ->
         error_message =
           body
-          |> Jason.decode!()
           |> Map.get("error")
           |> Map.get("message")
 
@@ -89,15 +87,13 @@ defmodule Codebattle.Auth.User.FirebaseUser do
       {:ok, %Req.Response{status: 200, body: body}} ->
         firebase_uid =
           body
-          |> Jason.decode!()
           |> Map.get("localId")
 
         {:ok, firebase_uid}
 
       {:ok, %Req.Response{status: 400, body: body}} ->
         error_message =
           body
-          |> Jason.decode!()
           |> Map.get("error")
           |> Map.get("message")
 
@@ -122,7 +118,6 @@ defmodule Codebattle.Auth.User.FirebaseUser do
       {:ok, %Req.Response{status: 400, body: body}} ->
         error_message =
           body
-          |> Jason.decode!()
           |> Map.get("error")
           |> Map.get("message")