Show unable to decrypt events in the room list

These were previously (unintentionally) filtered, but I wanted to add
them because without showing and caching them my DMs look extremely out
of order. And assuming that you get an unexpected "unable to decrypt"
event, you would want that room to "shoot to the top" anyway.

src/libneochat/eventhandler.cpp

@@ -448,6 +448,9 @@ QString EventHandler::getBody(const NeoChatRoom *room, const Quotient::RoomEvent
         [](const PollStartEvent &e) {
             return e.question();
         },
+        [](const EncryptedEvent &) {
+            return i18nc("@info In room list", "Encrypted event");
+        },
         i18n("Unknown event"));
 }
 

src/libneochat/neochatroom.cpp

@@ -359,9 +359,14 @@ const RoomEvent *NeoChatRoom::lastEvent(std::function<bool(const RoomEvent *)> f
         if (auto lastEvent = eventCast<const RoomMessageEvent>(event)) {
             return lastEvent;
         }
+
         if (auto lastEvent = eventCast<const PollStartEvent>(event)) {
             return lastEvent;
         }
+
+        if (auto lastEvent = eventCast<const EncryptedEvent>(event)) {
+            return lastEvent;
+        }
     }
 
     if (m_cachedEvent != nullptr) {