Fix coding style offenses in pipeline chain classes

app/services/ci/create_pipeline_service.rb

@@ -28,7 +28,6 @@ module Ci
                                project: project,
                                current_user: current_user)
 
-
       sequence = Gitlab::Ci::Pipeline::Chain::Sequence
         .new(pipeline, command, SEQUENCE)
 

lib/gitlab/ci/pipeline/chain/create.rb

@@ -9,9 +9,7 @@ module Gitlab
             ::Ci::Pipeline.transaction do
               pipeline.save!
 
-              if @command.seeds_block
-                @command.seeds_block.call(pipeline)
-              end
+              @command.seeds_block&.call(pipeline)
 
               ::Ci::CreatePipelineStagesService
                 .new(project, current_user)