FIFOPlayerWindow: Trigger destructor on Dolphin shutdown

Make MainWindow::m_fifo_window a unique_ptr to ensure its destructor is
triggered when MainWindow is destroyed.

FIFOPlayerWindow doesn't set MainWindow as its parent in order to
prevent raising MainWindow when focusing FIFOPlayerWindow. This avoids
MainWindow covering up RenderWidget when, e.g., trying to use the object
range feature to pinpoint the index of a particular object.

As a consequence, unlike most QObjects FIFOPlayerWindow wasn't destroyed
when its parent widget was since it didn't have one.

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