When changing "active" load pixmap right away

The active property is usualy set in response to a hover event.
Loading the new pixmap right away, starting the fade animation immediately, provides
a more responsive user experience.

REVIEW: 122857

src/declarativeimports/core/iconitem.cpp

@@ -209,7 +209,7 @@ void IconItem::setActive(bool active)
 
     m_active = active;
     if (isComponentComplete()) {
-        m_loadPixmapTimer.start();
+        loadPixmap();
     }
     emit activeChanged();
 }