Remove .form-inline from compare branch page

app/views/projects/merge_requests/creations/_new_compare.html.haml

 %h3.page-title
   New Merge Request
 
-= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], url: project_new_merge_request_path(@project), method: :get, html: { class: "merge-request-form form-inline js-requires-input" } do |f|
+= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], url: project_new_merge_request_path(@project), method: :get, html: { class: "merge-request-form js-requires-input" } do |f|
   .hide.alert.alert-danger.mr-compare-errors
   .js-merge-request-new-compare.row{ 'data-source-branch-url': project_new_merge_request_branch_from_path(@source_project), 'data-target-branch-url': project_new_merge_request_branch_to_path(@source_project) }
     .col-lg-6