Fix target project merge request link on build page

app/serializers/build_details_entity.rb

@@ -16,7 +16,8 @@ class BuildDetailsEntity < JobEntity
     end
     expose :path do |build|
-      project_merge_request_path(build.project, build.merge_request)
+      project_merge_request_path(build.merge_request.project,
+                                 build.merge_request)
     end
   end

spec/serializers/build_details_entity_spec.rb

@@ -81,9 +81,9 @@ describe BuildDetailsEntity do
           expect(subject[:merge_request][:iid]).to eq merge_request.iid
         end
-        it 'has a correct merge request path' do
+        it 'has a merge request path to a target project' do
           expect(subject[:merge_request][:path])
-            .to include fork_project.full_path
+            .to include project.full_path
         end
       end