[Bug]: json.indent() omits returning objects with a key = "class"

[Baaaaaz]

Describe the Bug

The json.indent() function has an issue with json objects keys called "class" (in lowercase) and omits them from the returned value.

To Reproduce

Add the following to a new macro, run and observe results.

[r: vJson = json.set("{}", "class", "not so classy", "CLASS", "but this is")]
[r: "<pre>" + json.indent(vJson) + "</pre>"]

Expected Behaviour

json.indent() function does not omit anyhting.

Screenshots

MapTool Info

No response

Desktop

No response

Additional Context

Originally noticed here: https://discord.com/channels/296230822262865920/1334553385440907374/1337233348803956808

[kwvanderlinde]

Fixed by accident in #5217.

Provided macro now prints:

{"class":"not so classy","CLASS":"but this is"}
{
  "class": "not so classy",
  "CLASS": "but this is"
}