[Client] Address tournament UI review feedback

- Drop the in-game tournament-settings button: Command_TournamentSettingsSelect
  has no server handler (RespContextError), the host-ness decision was evaluated
  once at tab construction, and the button never received a label on first show.
  The dialog can be re-added together with a working Server_Player override.
- Pass PlayerManager::isSpectator() to TournamentWidget instead of relying on
  localPlayerId == -1, which never holds for spectators.
- Report games per match as the total series length (Best of %1) to match the
  DlgTournamentSettings hint and the server's use of the value; the previous
  gamesPerMatch * 2 - 1 mislabeled Bo3 as Best of 5.
- Block signals around read-only tournamentCheckBox setChecked so the disabled
  settings button is not re-enabled, and seed Command_CreateGame through
  mutable_tournament_settings() (field 15 became the settings message).
- return after closing a sub-game that routed to its parent tab.

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

@@ -989,12 +989,9 @@ bool TabGame::switchToGameTab(int gameId)
 void TabGame::closeGame()
 {
     int parentId = game->getGameMetaInfo()->parentGameId();
-    if (parentId >= 0) {
-        if (switchToGameTab(parentId)) {
-            close();
-        }
-        // If the parent tab is gone, fall through to the normal leave-game
-        // flow instead of stranding the user on a dead sub-game tab.
+    if (parentId >= 0 && switchToGameTab(parentId)) {
+        close();
+        return;
     }
 
     gameMenu->clear();