Fixed: Regression in key navigation on TableView

It turns out the currentIndex/CurrentRow was updated but the selection,
was ignored for the last row in a TableView.

[ChangeLog][Qt Quick Controls][Fixed: TableView regression where
the last row in a TableView could not be selected by keyboard.]

Task-number: QTBUG-35572
Change-Id: Ifdf11f665733dd63ba56e12fe0dabdd7932a4ab9
Reviewed-by: Caroline Chao <caroline.chao@digia.com>