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fix bug in dcr instruction: always either set or clr zero flag

--- a/das.c

+++ b/das.c

@@ -690,9 +690,13 @@

 	if(--x == 0)

 		cpu->flg |= Fzero;

-	cpu->flg &= ~Fsign;

+	else

+		cpu->flg &= ~Fzero;

+

 	if((x&0x80) != 0)

 		cpu->flg |= Fsign;

+	else

+		cpu->flg &= ~Fsign;

 	if(insn->r1 == M)

 		memwrite(a, x);