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games/mix: fix SLAX and SRAX instructions (thanks nicolagi)

MIX shift instructions shift by bytes not bits.

--- a/sys/src/games/mix/mix.c

+++ b/sys/src/games/mix/mix.c

@@ -668,9 +668,9 @@

 	rax |= rx & MASK5;

 	rx &= ~MASK5;

 	if(left)

-		rax <<= m;

+		rax <<= m*BITS;

 	else

-		rax >>= m;

+		rax >>= m*BITS;

 	rx |= rax & MASK5;

 	ra |= rax>>5*BITS & MASK5;

 }