Allow all users to delete their account

Previously the user could not delete his own account unless signup was
enabled in the global settings. This was due to the fact that deleting
the user would also delete the issues and other items associated to him.
Deleting an user does not destroy essential data anymore, for this
reason we removed the `signup_enabled?` check.

app/views/profiles/accounts/show.html.haml

@@ -92,8 +92,7 @@
             Update username
   %hr
 
-- if signup_enabled?
-  .row.prepend-top-default
+.row.prepend-top-default
   .col-lg-4.profile-settings-sidebar
     %h4.prepend-top-0.danger-title
       Remove account

changelogs/unreleased/36087-users-cannot-delete-their-account.yml

+---
+title: allow all users to delete their account
+merge_request: 13636
+author: Jacopo Beschi @jacopo-beschi
+type: changed

spec/features/profile_spec.rb

@@ -7,9 +7,8 @@ describe 'Profile account page' do
     sign_in(user)
   end
 
-  describe 'when signup is enabled' do
+  describe 'when I delete my account' do
     before do
-      stub_application_setting(signup_enabled: true)
       visit profile_account_path
     end
 
@@ -21,18 +20,6 @@ describe 'Profile account page' do
     end
   end
 
-  describe 'when signup is disabled' do
-    before do
-      stub_application_setting(signup_enabled: false)
-      visit profile_account_path
-    end
-
-    it 'does not have option to remove account' do
-      expect(page).not_to have_content('Remove account')
-      expect(current_path).to eq(profile_account_path)
-    end
-  end
-
   describe 'when I reset private token' do
     before do
       visit profile_account_path