[GREEN] fixing linter

lib/pages/login/Login.dart

 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
-import 'package:fundex_app/main-screen.dart';
 import 'package:fundex_app/api/api.dart';
 import 'package:fundex_app/pages/forget-password/ForgetPassword.dart';
 import 'package:fundex_app/pages/payment/CancelConfirmation.dart';