pluginbase/preferences: Initialized s with nullptr.

The fact that it was not initialized caused unwanted behaviors.

Signed-off-by: andreidanila1 <[email protected]>

pluginbase/src/preferences.cpp

@@ -11,6 +11,7 @@ Preferences *Preferences::pinstance_{nullptr};
 
 Preferences::Preferences(QObject *parent)
 	: QObject(parent)
+	, s(nullptr)
 {
 	connect(parent, SIGNAL(aboutToQuit()), this, SLOT(save()));
 }