Emit ctkVTKSlicerView::resized after vtkRenderWindow size is set.

Since the Size of the vtkRenderWindow associated with QVTKWidget is
set in the QVTKWidget::resizeEvent, the "resized" signal should be emitted
after the renderWindow size has been set.

Fixes http://na-mic.org/Mantis/view.php?id=1914

The behavior before/after this commit is illustrated by the following
pseudo code:

[Before]

  ctkVTKSliceView::resizeEvent(event)
  emit resized(event->size())
  QVTKWidget::resizeEvent(event)
  vtkRenderWindow::SetSize(size)

[After]

  ctkVTKSliceView::resizeEvent(event)
  QVTKWidget::resizeEvent(event)
  vtkRenderWindow::SetSize(size)
  emit resized(event->size())
Merge branch 'slicer-1914-fix-ctkVTKSliceView-resize-event'

* slicer-1914-fix-ctkVTKSliceView-resize-event:
  Emit ctkVTKSlicerView::resized after vtkRenderWindow size is set.