platform/x86: thinkpad_acpi: Fix thinklight LED brightness returning 255

Reading the thinklight LED brightnes while the LED is on returns
255 (LED_FULL) but we advertise a max_brightness of 1, so this should
be 1 (LED_ON).

Fixes: db5e2a4c ("platform/x86: thinkpad_acpi: Fix max_brightness of thinklight")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230127235723.412864-1-hdegoede@redhat.com

drivers/platform/x86/thinkpad_acpi.c

@@ -5563,7 +5563,7 @@ static int light_sysfs_set(struct led_classdev *led_cdev,
 
 static enum led_brightness light_sysfs_get(struct led_classdev *led_cdev)
 {
-	return (light_get_status() == 1) ? LED_FULL : LED_OFF;
+	return (light_get_status() == 1) ? LED_ON : LED_OFF;
 }
 
 static struct tpacpi_led_classdev tpacpi_led_thinklight = {