Modified PoL maps loading with SW/demo resources

[Branikolog]

Preliminary checks

• I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

In a case we try to load PoL map manually renamed in SW format the game just jumps back to the main menu:

2024-11-02.14-31-10.mp4

Describe the possible solution

I suggest showing some pop up window noting that the engine can not load the map due to lacking of the full version.

I also suggest mentioning in the first startup dialogs or scenario selection dialog, that you will not able to run any PoL or fh2 map.

Additional info

No response