fix memory leak in rules

Author: liudongmiao

headers/modsecurity/rule_with_actions.h

@@ -43,7 +43,7 @@ class RuleWithActions : public Rule {
         std::unique_ptr<std::string> fileName,
         int lineNumber);
 
-    ~RuleWithActions();
+    virtual ~RuleWithActions();
 
     RuleWithActions(const RuleWithActions& r)
         : Rule(r),