Remove redundant const specifier

src/base/preferences.cpp

@@ -92,7 +92,7 @@ void Preferences::freeInstance()
     m_instance = nullptr;
 }
 
-const QVariant Preferences::value(const QString &key, const QVariant &defaultValue) const
+QVariant Preferences::value(const QString &key, const QVariant &defaultValue) const
 {
     return SettingsStorage::instance()->loadValue(key, defaultValue);
 }

src/base/preferences.h

@@ -81,7 +81,7 @@ class Preferences : public QObject
 
     Preferences();
 
-    const QVariant value(const QString &key, const QVariant &defaultValue = {}) const;
+    QVariant value(const QString &key, const QVariant &defaultValue = {}) const;
     void setValue(const QString &key, const QVariant &value);
 
     static Preferences *m_instance;