Address cppcheck warnings: uselessOverride (The function '...' overrides a function in a base class but is identical to the overridden function)

src/actions/set_sid.h

@@ -40,7 +40,6 @@ class SetSID : public Action {
             m_string(std::move(z)) { }
 
     bool evaluate(RuleWithActions *rule, Transaction *transaction) override;
-    bool init(std::string *error) override;
 
  private:
     std::unique_ptr<RunTimeString> m_string;