Harmless optimization

CURA-11978

Author: wawanbreton

include/settings/Settings.h

@@ -44,7 +44,7 @@ class Settings
      * \param value The value of the setting. The value is always added and
      * stored in serialised form as a string.
      */
-    void add(const std::string& key, const std::string value);
+    void add(const std::string& key, const std::string& value);
 
     /*!
      * \brief Get the value of a setting.

src/settings/Settings.cpp

@@ -41,7 +41,7 @@ Settings::Settings()
     parent = nullptr; // Needs to be properly initialised because we check against this if the parent is not set.
 }
 
-void Settings::add(const std::string& key, const std::string value)
+void Settings::add(const std::string& key, const std::string& value)
 {
     if (settings.find(key) != settings.end()) // Already exists.
     {