Fix #5774: Unused non-roll shortcuts in lobby

Cause:
Player menu shortcuts are activated as soon as a local
player is added, which happens in the deck selection
lobby before the game starts.
Resolution:
Disable full shortcut activation until the game has
started.
Allow only the roll-die shortcut (Ctrl+I) while in the
lobby.

cockatrice/src/game/player/menu/utility_menu.h

@@ -23,6 +23,7 @@ public slots:
 
 public:
     explicit UtilityMenu(Player *player, QMenu *playerMenu);
+    void setLobbyShortcutsActive();
 
     [[nodiscard]] bool createAnotherTokenActionExists() const
     {