On fades, only unhighlight if already highlight.

In added services, when you fade a service, it should also toggle
highlights off. The original code would toggle the highlight flag
regardless of whether it actually needed it, which causes problems
downstream in the code.
Merge pull request #656 from kadams54/fix-unhiding-unrelated-service

On fades, only unhighlight if already highlight.

In added services, when you fade a service, it should also toggle
highlights off. The original code would toggle the highlight flag
regardless of whether it actually needed it, which causes problems
downstream in the code.