[Theme] `sunlust` theme does not work for JSON or YAML diagram/data

[The-Lum]

Hello PlantUML team, (and @theavege),

Describe the bug During theme galery tests, I discovered this issue:

• this sunlust theme does not work for JSON or YAML diagram/data [Probably due to some JSON conf. tables on this theme]

Tests and Screenshots

• JSON

  @startjson
  !theme sunlust
  {
  "fruit":"Apple",
  "size": "Large",
  "color": ["Red", "Green"]
  }
  @endjson

  

• YAML

  @startyaml
  !theme sunlust
  fruit: Apple
  size: Large
  color:
  - Red
  - Green
  @endyaml

  

PlantUML version

• Tested on version 1.2024.4

Additional context [Origin Ref. or History of this theme: #1677, #1681, #1691]

[The-Lum]

Fixed by #1727.