Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace.

Task-number: QTBUG-99313
Change-Id: I88edd91395849574436299b8badda21bb93bea39
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmldesigner/components/materialbrowser/materialbrowserview.cpp

@@ -90,7 +90,7 @@ WidgetInfo MaterialBrowserView::widgetInfo()
                                 propNames.append(changedProp.name());
                         }
                     }
-                    for (const PropertyName &propName : qAsConst(propNames)) {
+                    for (const PropertyName &propName : std::as_const(propNames)) {
                         if (propName != "objectName")
                             mat.removeProperty(propName);
                     }