hidpp20: require HIDPP_PAGE_COLOR_LED_EFFECTS for LEDs to work
hidpp20: require HIDPP_PAGE_COLOR_LED_EFFECTS for LEDs to work

If HIDPP_PAGE_COLOR_LED_EFFECTS fails but the profile returns a nonzero LED
count we crash later in hidpp20drv_read_led() because all the led info is
null.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

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