QmlDesigner: Load effect maker nodes' icons

Also remove some unused code.

Fixes: QDS-10426
Change-Id: I71c4fde339261e2856472c15bde56ee8850ed236
Reviewed-by: Amr Elsayed <amr.elsayed@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>

src/plugins/qmldesigner/components/effectmaker/effectnode.cpp

@@ -5,12 +5,8 @@
 
 namespace QmlDesigner {
 
-EffectNode::EffectNode(const QString &name)
-    : m_name(name) {}
-
-QString EffectNode::name() const
-{
-    return m_name;
-}
+EffectNode::EffectNode(const QString &name, const QString &iconPath)
+    : m_name(name)
+    , m_iconPath(QUrl::fromLocalFile(iconPath)) {}
 
 } // namespace QmlDesigner