Fix TAB codes glitch

Author: boriel

src/arch/zx48k/library-asm/print.asm

@@ -249,13 +249,13 @@ __PRINT_COM:
 
 __PRINT_TAB:
         ld hl, __PRINT_TAB1
-        jp __PRINT_SET_STATE
+        jr __PRINT_SET_STATE
 
 __PRINT_TAB1:
-        ld (MEM0), a         
+        ld (MEM0), a
+        exx
         ld hl, __PRINT_TAB2
-        ld (PRINT_JUMP_STATE), hl
-        ret
+        jr __PRINT_SET_STATE
 
 __PRINT_TAB2:
         ld a, (MEM0)        ; Load tab code (ignore the current one)