`mask_input` does not hide text in the playground

Styling option `mask_input` does not render in the playground, works fine in coder/coder.

https://playground.coder.app/parameters/ppU-YGLJoR

```terraform
data "coder_parameter" "private_api_key" {
name = "private_api_key"
display_name = "Your super secret API key"
type = "string"

form_type = "input" # | "textarea"

# Will render as "**********"
default = "privatekey"

styling = jsonencode({
mask_input = true
})
}
```