Apple Thunderbolt Display 27" - brightness_max is too low

[romamix]

With Apple Thunderbolt Display 27" and Lenovo ThinkPad X390 Yoga, the max available brightness through increments is too low:

  DeviceId ( Vendor vendor_, Product product_, string description_,
		 int brightness_min = 0, int brightness_max = 255 )

Monitor supports the brightness level up to 65535, so fixing the line helps:

  DeviceId ( Vendor vendor_, Product product_, string description_,
		 int brightness_min = 0, int brightness_max = 65535 )

I don't have any other monitor to check whether this value is different/dynamic on different displays, or if a FW update for the Thunderbolt Display changed it at certain moment, so this issue is more for the people who are struggling with a same monitor.