fix tiny typo

[Mariusthvdb]

hidden: -> hidden;

[ildar170975]

I do not think this should be easily fixed...
With fix:

type: entities
entities:
  - type: custom:fold-entity-row
    head:
      entity: sun.sun
    open: true
    entities:
      - input_boolean.test_boolean
      - input_boolean.test_boolean

W/o fix:

[Mariusthvdb]

you mean this is not a typo, but an intended : ?

if so, Ill close.

(doesnt seem to hurt here. I even deleted the complete #items section in my local version and the fold row still works...)

[ildar170975]

Do not think this was intended.
Probably it was a typo - and thus issues were not discovered while testing((
Suggest you to NOT close this PR - but it should not be merged blindly, it requires adding some changes.