857 | Fixed BUG: IVR Providers are not visible in test call

https://trello.com/c/xJqnBHSl

Correct name of class containing Providers "(...)service.contract.IVRService" instead of "(...)service.IVRService",
removed blank field in providers list.

Change-Id: Idfa004a08cc4c08eaab2967082b1484b2e49898f