Port away from about to be deprecated IconSize() method

src/plugin/icon.cpp

@@ -138,7 +138,7 @@ void IconNode::render(Grantlee::OutputStream *stream, Grantlee::Context *c) cons
     const QString html = QStringLiteral("<img src=\"file://%1\" align=\"top\" height=\"%2\" width=\"%2\" alt=\"%3\" title=\"%4\" />")
                          .arg(KIconLoader::global()->iconPath(iconName, mSizeOrGroup < KIconLoader::LastGroup ? mSizeOrGroup : -mSizeOrGroup))
                          .arg(mSizeOrGroup < KIconLoader::LastGroup
-                              ? IconSize(static_cast<KIconLoader::Group>(mSizeOrGroup))
+                              ? KIconLoader::global()->currentSize(static_cast<KIconLoader::Group>(mSizeOrGroup))
                               : mSizeOrGroup)
                          .arg(altText.isEmpty() ? iconName : altText, altText); // title is intentionally blank if no alt is provided
     (*stream) << Grantlee::SafeString(html, Grantlee::SafeString::IsSafe);