Update feit_dimmer.yaml (#5009)
* Update feit_dimmer.yaml
Added additional dps entries for feit_dimmer
* Update feit_dimmer.yaml
Fix to remove trailing spaces and tab
* Update feit_dimmer.yaml
Removed tab characters
* feat(feit_dimmer): use light entity for indicator
- use a light entity per the standard pattern for switch indicators.
- make the new entity hidden if unavailable, as it does not seem to exist in previous requests #752, #4280, #4325
PR #5009
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Co-authored-by: Jason Rumney <make-all@users.noreply.github.com>