Qt: Use SVGWidget for empty game list icon

src/duckstation-qt/emptygamelistwidget.ui

@@ -40,7 +40,7 @@
       </spacer>
      </item>
      <item>
-      <widget class="QLabel" name="icon">
+      <widget class="SVGWidget" name="icon">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
@@ -193,6 +193,13 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>SVGWidget</class>
+   <extends>QWidget</extends>
+   <header>svgwidget.h</header>
+  </customwidget>
+ </customwidgets>
  <resources>
   <include location="resources/duckstation-qt.qrc"/>
  </resources>

src/duckstation-qt/gamelistwidget.cpp

@@ -1860,7 +1860,7 @@ GameListWidget::GameListWidget(QWidget* parent, QAction* action_view_list, QActi
   Ui::EmptyGameListWidget empty_ui;
   empty_ui.setupUi(m_empty_widget);
   empty_ui.supportedFormats->setText(qApp->translate("GameListWidget", SUPPORTED_FORMATS_STRING));
-  empty_ui.icon->setPixmap(QIcon(":/icons/monochrome/svg/information-line.svg"_L1).pixmap(72));
+  empty_ui.icon->setSource(":/icons/monochrome/svg/information-line.svg"_L1);
   m_ui.stack->insertWidget(2, m_empty_widget);
 
   m_ui.viewGameList->setDefaultAction(action_view_list);