[DeckShare] Close public decks tabs when the client disconnects

TabSupervisor::stop() built tabsToDelete from the room and game tabs
only, so a public decks tab survived a disconnect, sitting with stale
contents and a refresh button that kept hitting the dead client. Its
values are now folded into the same cleanup.

cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp

@@ -631,6 +631,10 @@ void TabSupervisor::stop()
         tabsToDelete << i.value();
     }
 
+    for (auto i = publicDecksTabs.cbegin(), end = publicDecksTabs.cend(); i != end; ++i) {
+        tabsToDelete << i.value();
+    }
+
     for (const auto tab : tabsToDelete) {
         tab->close();
     }