rectify icon path

GUI/Views/SampleDesigner/ParticleView.cpp

@@ -98,7 +98,7 @@ void ParticleView::updatePixmap()
         return;
 
     QString ff_type = dynamic_cast<ParticleItem*>(getItem())->formFactorItem()->currentType();
-    QString filename = QString(":/widgetbox/images/ff_%1_64x64.png").arg(ff_type);
+    QString filename = QString(":/SampleDesignerToolbox/images/ff_%1_64x64.png").arg(ff_type);
     m_pixmap = QPixmap(filename);
 }