Update a theme

curl --request PATCH \
  --url https://api.propal.io/v1/themes/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "font": "inter",
  "body_theme": "white",
  "color_accent": "blue",
  "colors": {},
  "section_styles": [
    {}
  ],
  "radius": 123,
  "button_radius": 123,
  "is_default": true
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "font": "<string>",
  "body_theme": "<string>",
  "color_accent": "<string>",
  "colors": {},
  "radius": 123,
  "button_radius": 123,
  "is_default": true,
  "created_at": "<string>",
  "updated_at": "<string>",
  "section_styles": null
}