QTableView::sizeHintForRow move word wrap into heightHintForIndex

In 03c761287f1a007c7177d90ed81341d0147eae05 it was overlooked
that word wrap handling (with advantage) could be moved into the
function, too.

This patch makes the code more readable, but does not change
anything.

Change-Id: Ifed349398b862650da383e4e6fd337a166dc680e
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
QTableView::sizeHintForRow minor fix of word wrap in a special case

In case we do a resizeSection to 0 (can also happen by a reset)
then the auto resize won't work with word wrap. The first resize
afterwards it will only resize to a single line.

Change-Id: I3abf779ecb0593b6721f5af16f7a39d05004e98f
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>