Fix RemoteVstPlugin not exiting when effect removed

plugins/VstEffect/VstEffectControlDialog.cpp

@@ -289,7 +289,12 @@ void VstEffectControlDialog::showEvent(QShowEvent *_se)

VstEffectControlDialog::~VstEffectControlDialog()
{
	//delete m_pluginWidget;
#if !(QT_VERSION < 0x050000 && defined(LMMS_BUILD_LINUX))
	if (m_pluginWidget && layout()) {
		layout()->removeWidget(m_pluginWidget);
		m_pluginWidget->setParent(nullptr);
	}
#endif
}

src/gui/widgets/EffectView.cpp

@@ -164,18 +164,7 @@ EffectView::EffectView( Effect * _model, QWidget * _parent ) :

EffectView::~EffectView()
{

#ifdef LMMS_BUILD_LINUX

	delete m_subWindow;
#else
	if( m_subWindow )
	{
		// otherwise on win32 build VST GUI can get lost
		m_subWindow->hide();
	}
#endif

}