Fixes broken visual effects on The Ukrainian Prisoner (and potentially other heists) when using default colour grading

---

Notes:

• "color_payday" is the actual "off" colour grading, but Ukrainian Prisoner is set to use "color_off"
• This issue seems to break some effects like hitflash or last down greyscaling

---

For modders:

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

local set_default_color_grading_original = CoreEnvironmentControllerManager.set_default_color_grading
function CoreEnvironmentControllerManager:set_default_color_grading(color_grading, ...)
	color_grading = color_grading == "color_off" and "color_payday" or color_grading
	return set_default_color_grading_original(self, color_grading, ...)
end