Change lock key in ProjectRecalculateWorker

This MR makes a tiny change in the
lock key in ProjectRecalculateWorker, so
that the lock is based on the project id.

app/workers/authorized_project_update/project_recalculate_worker.rb

@@ -26,7 +26,7 @@ module AuthorizedProjectUpdate
     private
 
     def lock_key(project)
-      "#{self.class.name.underscore}/#{project.root_namespace.id}"
+      "#{self.class.name.underscore}/projects/#{project.id}"
     end
   end
 end

spec/workers/authorized_project_update/project_recalculate_worker_spec.rb

@@ -43,7 +43,7 @@ RSpec.describe AuthorizedProjectUpdate::ProjectRecalculateWorker do
     end
 
     context 'exclusive lease' do
-      let(:lock_key) { "#{described_class.name.underscore}/#{project.root_namespace.id}" }
+      let(:lock_key) { "#{described_class.name.underscore}/projects/#{project.id}" }
       let(:timeout) { 10.seconds }
 
       context 'when exclusive lease has not been taken' do