more angry god vs pacifist conduct

Do it properly, using the arguments to xkilled() instead of reversing
the conduct counter after the fact.

The xkilled() flag value of '1' has been reversed.  It used to mean
'display message' but now means 'suppress message' since both of the
other flag bits are for suppression.  All callers have been updated
to specify either XKILL_GIVEMSG or XKILL_NOMSG so the underlying
number remains transparent.

src/read.c

@@ -1744,9 +1744,9 @@ boolean confused, byu;
         }
         mtmp->mhp -= mdmg;
         if (mtmp->mhp <= 0) {
-            if (byu)
-                xkilled(mtmp, 1);
-            else {
+            if (byu) {
+                killed(mtmp);
+            } else {
                 pline("%s is killed.", Monnam(mtmp));
                 mondied(mtmp);
             }