Fix navigation pop for split screens

Linked to #315

components/ConversationListItem.tsx

@@ -123,7 +123,7 @@ const ConversationListItem = memo(function ConversationListItem({
           });
           // Take the user back to wherever the conversation was restored "to"
           // https://github.com/ephemeraHQ/converse-app/issues/315#issuecomment-2312903441
-          navigation.pop(2);
+          navigation.pop(isSplitScreen ? 1 : 2);
         },
         [translate("cancel")]: () => {},
       };