httptest.update does not update step keys

Steps to reproduce:

1. Create a host with web scenario
2. Make an API call with only new web scenario name:

   "method": "httptest.update",
   "params": {
       "httptestid": "5",
       "name": "Avocado"
   }

Result:
In database observe that key names was changed only for web scenario related items. The key was not updated for any web scenario step related items.

Expected:
Item keys should be updated for all items related to this web scenario (web scenario based and step based items)