shell: Avoid double border on #service page.
shell: Avoid double border on #service page.

By making the list-group be the first sibling after the panel-heading
as expected by the CSS.

Fixes #700
Closes #1067
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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