fix: check contact status

-When checking if contact accept the invitation conversation ringId was 
used and that caused error when conversation is not exists. This patch 
fix it by using recepient ringID.
-Conversation View Model is creating two times for each conversation. 
One when creating SmartList and then when conversation is celected. 
This patch use existing view model to present cinversation.

Change-Id: I67cb334efc61017b5b1f26573879b736a83b0fa3
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>

Ring/Ring/Features/Conversations/Conversation/ConversationViewModel.swift

@@ -87,7 +87,7 @@ class ConversationViewModel: ViewModel {
                 self.inviteButtonIsAvailable.onNext(!contact.confirmed)
             }
             self.contactsService.contactStatus.filter({ cont in
-                return cont.ringId == contact?.ringId
+                return cont.ringId == contactRingId
             })
                 .subscribe(onNext: { [unowned self] cont in
 

Ring/Ring/Features/Conversations/ConversationsCoordinator.swift

@@ -64,7 +64,7 @@ class ConversationsCoordinator: Coordinator, StateableResponsive {
 
     private func showConversation (withConversationViewModel conversationViewModel: ConversationViewModel) {
         let conversationViewController = ConversationViewController.instantiate(with: self.injectionBag)
-        conversationViewController.viewModel.conversation = conversationViewModel.conversation
+        conversationViewController.viewModel = conversationViewModel
         self.present(viewController: conversationViewController, withStyle: .show, withAnimation: true)
     }
 }