Update 1.5.7 Custom Game Difficulty Restriction

Here are the quick details:

- Added restrictions for custom game before you start the game.
- Fixed a restriction glitch with custom game that allowed players to set higher difficulties with higher lives.

To explain, custom game settings once let you set higher difficulties to have any amount of lives and continues. Then when you start the game, the restrictions enforced with the three highest difficulties would happen. So it used to let you set 100 lives for Nightmare difficulty, but then when you start, you had 1 life as that's the restriction for Nightmare.

Now as you are setting up the custom games on higher difficulties, it shows these restriction. Nightmare will show you can only have 1 life. Hard difficulty will show you can have up to 10 lives. The three higher difficulties have restrictions, while the lower three difficulties have no restrictions.