BorderImage statusChanged signal fired twice on load local / empty file

The BorderImage::load function for src/quick/items/qquickborderimage.cpp has an emit statusChanged statement at the end, which seems superfluous, as each possible branch has a statusChanged event.

In the cases where the file is not in a loading state (e.g. does not have to be pulled from a network) or is empty, the statusChanged signal will be fired twice.