Fix logical error in listing from maclib.

It seems the code was similarly wrong before I introduced the flag
CALLED_NOLIST in f07c9045f5.

No change in regression tests as we don't have macro libraries available
to test.

macros.c

@@ -250,7 +250,7 @@ MACRO          *defmacro(
 
         gb = new_buffer();
 
-        if (!(called & CALLED_NOLIST) && !list_md) {
+        if ((called & CALLED_NOLIST) && !list_md) {
             list_level--;
             levelmod = 1;
         }