[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/tournament_tab_game_extension.h

@@ -32,14 +32,12 @@ public:
 
 private slots:
     void onTournamentStateChanged(const Event_TournamentState &state);
-    void showTournamentSettingsDialog();
     void showOverviewPage();
     void showDeckViewPage();
     void openMatchGame(int gameId);
 
 private:
     void connectSignals();
-    [[nodiscard]] bool isLocalPlayerHost() const;
     void updateDeckViewStrip(const Event_TournamentState &state);
     void updateNavigationButtons(const Event_TournamentState &state);
 
@@ -48,7 +46,6 @@ private:
     QWidget *tournamentOverviewWidget = nullptr;
     QPushButton *backToGameButton = nullptr;
     QPushButton *standingsButton = nullptr;
-    QPushButton *settingsButton = nullptr;
     QLabel *deckViewStatusLabel = nullptr;
     Event_TournamentState::TournamentPhase lastKnownPhase = Event_TournamentState::PHASE_DECK_BUILDING;
     bool hasLastKnownPhase = false;