SessionControllerSpec: remove specific attribut test

change user.update(log_in_with_france_connect: nil) as log_in_france_connect is an enum

app/controllers/users/sessions_controller.rb

@@ -21,7 +21,7 @@ class Users::SessionsController < Sessions::SessionsController
     try_to_authenticate(Administrateur, remember_me)
 
     if user_signed_in?
-      current_user.update(loged_in_with_france_connect: '')
+      current_user.update(loged_in_with_france_connect: nil)
     end
 
     if gestionnaire_signed_in?

spec/controllers/users/sessions_controller_spec.rb

@@ -7,16 +7,8 @@ describe Users::SessionsController, type: :controller do
   end
 
   describe '#create' do
-    describe 'France Connect attribut' do
-      before do
-        post :create, params: { user: { email: user.email, password: user.password } }
-        user.reload
-      end
 
-      subject { user.loged_in_with_france_connect.present? }
 
-      it { is_expected.to be_falsey }
-    end
 
     context "unified login" do
       let(:email) { 'unique@plop.com' }