Fix template reference

This view was moved into `app/views/shared` in e7c7beeb, but
I missed one instance.

app/controllers/concerns/wiki_actions.rb

@@ -78,7 +78,7 @@ module WikiActions
 
   # rubocop:disable Gitlab/ModuleWithInstanceVariables
   def update
-    return render('empty') unless can?(current_user, :create_wiki, container)
+    return render('shared/wikis/empty') unless can?(current_user, :create_wiki, container)
 
     @page = WikiPages::UpdateService.new(container: container, current_user: current_user, params: wiki_params).execute(page)
 

spec/support/shared_examples/controllers/wiki_actions_shared_examples.rb

@@ -282,6 +282,18 @@ RSpec.shared_examples 'wiki controller actions' do
         expect(wiki_page.content).to eq new_content
       end
     end
+
+    context 'when user does not have edit permissions' do
+      before do
+        sign_out(:user)
+      end
+
+      it 'renders the empty state' do
+        subject
+
+        expect(response).to render_template('shared/wikis/empty')
+      end
+    end
   end
 
   def redirect_to_wiki(wiki, page)