Backport members SCSS changes

This commit backports the changes in
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/12304.

app/assets/stylesheets/pages/members.scss

@@ -130,9 +130,6 @@
 
 .members-ldap {
   align-self: center;
-  height: 100%;
-  margin-right: 10px;
-  margin-left: -49px;
 }
 
 .alert-member-ldap {

app/views/shared/members/_member.html.haml

@@ -53,7 +53,7 @@
           = time_ago_with_tooltip(member.created_at)
   - if show_roles
     - current_resource = @project || @group
-    .controls.member-controls
+    .controls.member-controls.row
       - if show_controls && member.source == current_resource
 
         - if member.can_resend_invite?