title: Angular schema form default not picking up
body: <p>we are using angular-schema-from for redring form from json schema and json from</p>
  
  <p>Some how we are not getting default value for enum,</p>
  
  <p>Please refer below form and schema...</p>
  
  <p>Schema json:</p>
  
  <pre><code>{
      "type": "object",
      "title": "Comment",
      "properties": {
          "contactDetails": {
              "title": "Contact Person",
              "type": "array",
              "minItems": 1,
              "items": {
                  "type": "object",
                  "properties": {
                      "contactType": {
                          "title": "Contact Type",
                          "description": "Select",
                          "type": "string",
                          "default": "test",
                          "enum": ["test", "test1"]
                      }
                  }
              }
          }
      }
  }
  </code></pre>
  
  <p>Form json:</p>
  
  <pre><code>[
      "contactDetails[].contactType",
      {
          "type": "submit",
          "style": "btn-info",
          "title": "OK"
      }
  ]
  </code></pre>