Removed unnecessarily converting set to array in conversation VC.
Removed unnecessarily converting set to array in conversation VC.

Eynaliyev/Atlas-Messenger-iOS,Eynaliyev/Atlas-Messenger-iOS,ropik/Atlas-Messenger-iOS,InterfaceInc/Atlas-Messenger-iOS,layerhq/Atlas-Messenger-iOS,InterfaceInc/Atlas-Messenger-iOS,ropik/Atlas-Messenger-iOS,layerhq/Atlas-Messenger-iOS,InterfaceInc/Atlas-Messenger-iOS