Add K710 with FN key swap support (pwr/Solaar#18)

The K710 keyboard is (according to the issue reporter) part of a MK710 combo
(which also contains a M705 mouse). Observing a succesful 07 register read,
I think that it is a HID++ 1.0 device too that uses the same register for FN
key swapping as K800.

lib/logitech/unifying_receiver/descriptors.py

@@ -91,6 +91,11 @@ _D('Wireless Keyboard K350')
 _D('Wireless Keyboard K360')
 _D('Wireless Touch Keyboard K400')
 _D('Wireless Solar Keyboard K750')
+_D('Wireless Keyboard K710',
+				settings=[
+							_register_fn_swap(0x09, true_value=b'\x00\x01', mask=b'\x00\x01'),
+						],
+				)
 _D('Wireless Illuminated Keyboard K800',
 				settings=[
 							_register_fn_swap(0x09, true_value=b'\x00\x01', mask=b'\x00\x01'),