Place point before value, not key, when down into object

When json-par-down (key i) is invoked before an object, the point is placed before value, not key of the first key-value pair.

Example (| is the point):

|{
  "key": "value"
}

// ↓ `i` (`json-par-down`)

{
  "key": |"value"
}

You can customize this with the variable json-par-place-after-down-into-object.