Fixed MassStorage based demos and projects resetting the SCSI sense values before the command is executed, leading to missed SCSI sense values when the host retrieves the sense key (thanks to Martin Degelsegger).

Added missing DataflashManager_CheckDataflashOperation() function to the MassStorageKeyboard demo, removed redundant SCSI_Codes.h file as these values are part of the MassStorage Class Driver.

Demos/Device/ClassDriver/MassStorageKeyboard/Lib/DataflashManager.h

@@ -83,5 +83,6 @@
 		                                     uint16_t TotalBlocks,
 		                                     uint8_t* BufferPtr) ATTR_NON_NULL_PTR_ARG(3);
 		void DataflashManager_ResetDataflashProtections(void);
+		bool DataflashManager_CheckDataflashOperation(void);
 		
 #endif