Fix resource spec after allowing GET requests earlier

spec/requests/api/v3/root_resource_spec.rb

@@ -74,9 +74,9 @@ describe 'API v3 Root resource' do
       end
 
       context 'without the X-requested-with header', skip_xhr_header: true do
-        it 'returns unauthorized regardless of the session validity' do
-          expect(response.status).to eq(401)
-          expect(response.body).to eq('unauthorized')
+        it 'returns OK because GET requests are allowed' do
+          expect(response.status).to eq(200)
+          expect(subject).to have_json_path('instanceName')
         end
       end
     end