shell: Fix dashboard plot highlighting
shell: Fix dashboard plot highlighting

 * There is no "series-plot" data attribute, so find the series
   belonging to an item via the address.

 * Only move the plot to the front when turning the highlight on, not
   when turning it off.

Closes #1572
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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