Fix saveless saving and quitting hiding buttons

Basically, when you save and quit, if you have a save, it attempts to
return to the `play` menu. Unfortunately for us, if you don't have a
save first, that menu never existed. You went directly from `mainmenu`
to the gameplay state. Since `play` never existed, the code didn't
have any menu to return to, so no buttons got created.

My fix is simple: if the menu isn't found, just make it.

desktop_version/src/Game.cpp

@@ -6578,11 +6578,14 @@ void Game::returntomenu(enum Menu::MenuName t)
 
         if (is_the_menu_we_want)
         {
-            break;
+            return;
         }
 
         i--;
     }
+
+    // If we didn't find the menu we wanted, just go to the menu we wanted
+    createmenu(t);
 }
 
 void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )