[Game] Don't alert game tab for spectator activity (#1848) (#7263)

Spectator join/leave events were triggering the game tab's attention
indicator (exclamation mark and taskbar alert) for players who often
leave the tab open while waiting for an opponent. This made spectator
activity a false alarm.

Only emit the user event when an actual player joins or leaves, keeping
spectator joins/leaves quiet.

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/game/game_event_handler.cpp

@@ -277,8 +277,6 @@ void GameEventHandler::eventSpectatorLeave(const Event_Leave &event,
     emit spectatorLeft(eventPlayerId);
 
     game->getPlayerManager()->removeSpectator(eventPlayerId);
-
-    emitUserEvent();
 }
 
 void GameEventHandler::eventGameStateChanged(const Event_GameStateChanged &event,
@@ -465,9 +463,9 @@ void GameEventHandler::eventJoin(const Event_Join &event, int /*eventPlayerId*/,
         PlayerLogic *newPlayer = game->getPlayerManager()->addPlayer(playerId, playerInfo.user_info());
         emit logJoinPlayer(newPlayer);
         emit playerJoined(playerInfo);
-    }
 
-    emitUserEvent();
+        emitUserEvent();
+    }
 }
 
 QString GameEventHandler::getLeaveReason(Event_Leave::LeaveReason reason)