keva_list_namespace returns incorrect format for pending new namespace

[kevacoin-project]

Steps to reproduce:

1. Create a new namespace

   keva_namespace my_new_namespace
   

2. While the namespace is still pending (not included in the next block), list the namespace

   keva_list_namespace
   

The namespace returned for the pending namespace is like:

{
    "Nc7SU3ZzaRaFpnBcGnChNJNHwj57pot2Ni": "insta"
}

It should be like:

{
    "namespaceId": "Nc7SU3ZzaRaFpnBcGnChNJNHwj57pot2Ni",
    "displayName": "insta"
}