Fixed mistake that crashes the game if you go to play singleplayer through the menu.

src/game/presentation/states/state_main_menu.c

@@ -75,8 +75,6 @@ static void state_render(Presentation_State *state) {
         case Main_Menu_Mode_Singleplayer: {
             ctx->mode = Main_Menu_Mode_Game_Setup;
             game_session_init_default_settings(false, &ctx->session_settings);
-            ctx->ingame_ctx->game_instance = ctx->game_instance;
-            presentation_state_machine_go_to(&presentation_state_ingame);
 
             break;
         }