Fix icon theme reference for searchIcon

Author: KangLin

Plugins/WebBrowser/AddressCompleter.cpp

@@ -523,7 +523,7 @@ QIcon CAddressCompleter::getIconForUrl(const QString &url)
     static QIcon defaultIcon;
     static QIcon httpIcon;
     static QIcon httpsIcon;
-    static QIcon searchIcon = QIcon::fromTheme(QIcon::ThemeIcon::SystemSearch);
+    static QIcon searchIcon = QIcon::fromTheme(QIcon::SystemSearch);
 
     if (url.startsWith("https://")) {
         return httpsIcon;