[idd] config: reload persisted display modes

Rebuild the driver's cached mode list before replugging the monitor so
Windows enumerates the settings saved by the helper.

Keep saved mode refresh rates intact and update only ExtraMode to the
configured default refresh.

idd/LGIdd/CPipeServer.cpp

@@ -262,7 +262,7 @@ void CPipeServer::HandleReloadSettings()
 
   AcquireSRWLockShared(&m_deviceContextLock);
   if (m_deviceContext)
-    m_deviceContext->ReplugMonitor();
+    m_deviceContext->ReloadSettings();
   ReleaseSRWLockShared(&m_deviceContextLock);
 }