nRF51.TWI: Fix Master_Receive
nRF51.TWI: Fix Master_Receive

The stop sequence was generated one byte too late.

Fabien-Chouteau/Ada_Drivers_Library,simonjwright/Ada_Drivers_Library,ellamosi/Ada_BMP_Library,AdaCore/Ada_Drivers_Library,simonjwright/Ada_Drivers_Library,AdaCore/Ada_Drivers_Library,Fabien-Chouteau/Ada_Drivers_Library