Fixed wrong value being used for users rules in dbfwfilter

A parsed, local copy of the string was duplicated instead of the original string
which caused the parsing to always fail.

server/modules/filter/dbfwfilter.c

@@ -1181,7 +1181,7 @@ bool parse_rule(char* rulestr, FW_INSTANCE* instance)
         else if (strcmp("users", tok) == 0)
         {
             /** Rules are applied to users after they have been parsed */
-            add_users(rule, instance);
+            add_users(rulestr, instance);
             rval = true;
         }
         else