deselect conversation when right panel disappear

When the back button is pressed, the selected conversation in the list
is now deselected. Prior to this patch, it was necessary to select
another conversation then the first one to reopen the chat view with
a contact.

Change-Id: I46a253ecd2161c76bb4d8bab26b7b1389248abc9
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
diff --git a/src/ConversationVC.h b/src/ConversationVC.h
index 887d8fb..c658882 100644
--- a/src/ConversationVC.h
+++ b/src/ConversationVC.h
@@ -21,6 +21,8 @@
 #import <api/conversation.h>
 #import <api/conversationmodel.h>
 
+@class RingWindowController;
+
 @interface ConversationVC : NSViewController
 
 -(void) initFrame;
@@ -36,4 +38,6 @@
 
 - (void) setConversationUid:(const std::string)convUid model:(lrc::api::ConversationModel*)model;
 
+- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil delegate:(RingWindowController*) mainWindow;
+
 @end