Deadly afflictions and resistances for safe_wait

Amend the safe_wait so it still waits if you have a deadly property,
even if you have a resistance to it.

External resistances do not protect against already existing
deadly properties, for example becoming deadly ill is not cured
even if you wear a green dragon scale mail.

src/do.c

@@ -2137,10 +2137,7 @@ zombify_mon(anything *arg, long timeout)
 static boolean
 danger_uprops(void)
 {
-    return ((Stoned && !Stone_resistance)
-            || Slimed
-            || Strangled
-            || (Sick && !Sick_resistance));
+    return (Stoned || Slimed || Strangled || Sick);
 }
 
 boolean