Updated for LiquidTWI2 library version 1.2.3

The new version of the library means that PANELOLU no longer needs to be
defined in LiquidTWI.h (the library file can be used as is) and the new
version of the library also enables the buzzer on the Panucatt VIKI
panel.
Merge commit '9322c408c68bc7c5edd88bf674f9f85fa0d2ffc5' into Personal

Conflicts:
	Marlin/Configuration.h