Sets the fn row to LED toggling (caps lock, scroll lock, RGB underglow, backlight).
F1 = Caps Lock
F2 = Scroll Lock
F3 = Backlight Toggle
F4 = Backlight Step
F5 = RGB Toggle
F6 = RGB Mode Cycle
F7 = RGB Hue Increase
F8 = RGB Hue Decrease
F9 = RGB Saturation Increase
F10 = RGB Saturation Decrease
F11 = RGB Value Increase
F12 = RGB Value Decrease