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Hide Main Menu Background Wall

Because nobody should have to lose their waifu wallpapers to fancy presentation.

Simply makes the wall prop transparent, and changes the properties of the background image itself so it isn't affected by the scene lighting.
You might need to fiddle with the background you want to use if it modifies background_default.vmt, as that's what I had to change to prevent the background from being too dark. Simply subscribing to this after the background might do the trick.

Pictured using this Sinon background, because lol.