playback-history-qt: Initialize default settings

They were defined but not used until now.

Author: radioactiveman

src/playback-history-qt/playback-history.cc

@@ -79,6 +79,7 @@ class PlaybackHistory : public GeneralPlugin
 
     constexpr PlaybackHistory() : GeneralPlugin(info, false) {}
 
+    bool init() override;
     void * get_qt_widget() override;
     int take_message(const char * code, const void *, int) override;
 };
@@ -807,6 +808,12 @@ void HistoryView::makeCurrent(const QModelIndex & index)
 
 static QPointer<HistoryView> s_history_view;
 
+bool PlaybackHistory::init()
+{
+    aud_config_set_defaults(configSection, defaults);
+    return true;
+}
+
 void * PlaybackHistory::get_qt_widget()
 {
     assert(!s_history_view);