By implementing the SwRect variant of
SwTextFrame::SwitchHorizontalToVertical() for the IsVertLRBT() == true
case.

The blinking cursor position after doc load is now correct.

Change-Id: I4862a6de286d3c0a34235fa0be8be2746b1a4151
Reviewed-on: https://gerrit.libreoffice.org/67880Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins