Revert extra CSS causing Gitaly Servers table to be misalgined

Closes #47648

Revert extra CSS causing Gitaly Servers table to be misalgined
3f5e302e · Stan Hu · f646a8b9 · 3f5e302e
--- a/app/views/admin/gitaly_servers/index.html.haml
+++ b/app/views/admin/gitaly_servers/index.html.haml
@@ -6,7 +6,7 @@
  - if @gitaly_servers.any?
    .table-holder
      %table.table.responsive-table
-        %thead.d-none.d-sm-none.d-md-block
+        %thead
          %tr
            %th= _("Storage")
            %th= n_("Gitaly|Address")