Remove qSort usages from widgets tests

QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: Ica7639d16f52b4ffcd2c00cc806fed1378a7948b
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Mac: Fix file dialog filters when filter doesn't start with '*'

Task-number: QTBUG-17326

Change-Id: I3e6ed40fdb0e04367bb031b2c674424a4b74af2f
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>