AR: Fix Memory Copy Without Pointer Support

Fix a bug when using AR codes with "Memory Copy Without Pointer Support"
code type which would write more data than it should.
Just the one in LogInfo.  Read_U8 could change the state of the emulated GameCube which is something we do not want to happen in informational code like logging.  ReadUnchecked_U8 will not change the state but will still return the requested information.