modplug: restore settings on load

The settings restoration is currently done in the preferences
dialog. This was dropped accidentally with the introduction of
coreservices in #3446.
Strictly speaking it would be cleaner to not rely on a temporary
widget here. For now this enures modplug tracker files can be
loaded and play correctly after application startup.

src/coreservices.cpp

@@ -23,6 +23,9 @@
 #include "mixer/playermanager.h"
 #include "moc_coreservices.cpp"
 #include "preferences/settingsmanager.h"
+#ifdef __MODPLUG__
+#include "preferences/dialog/dlgprefmodplug.h"
+#endif
 #include "soundio/soundmanager.h"
 #include "sources/soundsourceproxy.h"
 #include "util/db/dbconnectionpooled.h"
@@ -313,6 +316,13 @@ void CoreServices::initialize(QApplication* pApp) {
     m_pVCManager->init();
 #endif
 
+#ifdef __MODPLUG__
+    // Restore the configuration for the modplug library before trying to load a module.
+    DlgPrefModplug modplugPrefs{nullptr, pConfig};
+    modplugPrefs.loadSettings();
+    modplugPrefs.applySettings();
+#endif
+
     // Inhibit Screensaver
     m_pScreensaverManager = std::make_shared<ScreensaverManager>(pConfig);
     connect(&PlayerInfo::instance(),