Fix hide whitespace changes button

app/views/projects/diffs/_diffs.html.haml

@@ -13,7 +13,7 @@
         - if current_controller?(:commit)
           = commit_diff_whitespace_link(diffs.project, @commit, class: 'd-none d-sm-inline-block')
         - elsif current_controller?('projects/merge_requests/diffs')
-          = diff_merge_request_whitespace_link(diffs.project, @merge_request, class: 'd-none d-sm-block')
+          = diff_merge_request_whitespace_link(diffs.project, @merge_request, class: 'd-none d-sm-inline-block')
         - elsif current_controller?(:compare)
           = diff_compare_whitespace_link(diffs.project, params[:from], params[:to], class: 'd-none d-sm-inline-block')
       .btn-group