QmlDesigner: Fix fixResourcePaths()

QML does not accept absolute paths (e.g. C:\working\something\) as urls.
We need the file:/// prefix.

Change-Id: I9df74cd9c0e730fba056af971751f8eb88cdb536
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

share/qtcreator/qml/qmlpuppet/qmlprivategate/qmlprivategate_56.cpp

@@ -126,7 +126,7 @@ QVariant fixResourcePaths(const QVariant &value)
                         if (QFileInfo(fixedPath).exists()) {
                             fixedPath.replace(QLatin1String("//"), QLatin1String("/"));
                             fixedPath.replace(QLatin1Char('\\'), QLatin1Char('/'));
-                            return fixedPath;
+                            return QUrl::fromLocalFile(fixedPath);
                         }
                     }
                 }