fix(icons): restore smooth scaling to prevent jagged icon edges

Restore smooth=true behavior to avoid jagged edges when icons are scaled.

恢复平滑缩放以修复图标放大时圆角显示锯齿的问题。

Log: 恢复 DQuickDciIconImage 平滑缩放
PMS: BUG-308655
Influence: 修复 QML 中 DCI 图标放大时圆角显示锯齿的问题，图标边缘更平滑。

Author: re2zero

src/private/dquickdciiconimage.cpp

@@ -208,7 +208,6 @@ DQuickDciIconImage::DQuickDciIconImage(QQuickItem *parent)
     , DObject(*new DQuickDciIconImagePrivate(this))
 {
     D_D(DQuickDciIconImage);
-    setSmooth(false);
     connect(d->imageItem, &QQuickImage::implicitWidthChanged, this, [this, d]() { setImplicitWidth(d->imageItem->implicitWidth()); });
     connect(d->imageItem, &QQuickImage::implicitHeightChanged, this, [this, d]() { setImplicitHeight(d->imageItem->implicitHeight()); });
     connect(this, &DQuickDciIconImage::smoothChanged, d->imageItem, &QQuickImage::setSmooth);