Relayout the text after the vertical alignment is changed

In the designer it is no working without a layout update.

Task-number: QTBUG-32041
Change-Id: I2276914c81b38ad8931109b3d800b65a0d11bca7
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Reviewed-by: Alan Alpert (Personal) <416365416c@gmail.com>