Greyscales the screen at low health regardless of number of downs

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Notes:

• Was requested on the Mod Workshop Discord

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For modders:

• Hooks into core/lib/managers/coreenvironmentcontrollermanager
• Has priority 0
• This is the entirety of the Lua, all three lines of it:

Hooks:PreHook( CoreEnvironmentControllerManager, "set_post_composite", "llse_set_post_composite", function(self)
	self._last_life = true
end )